In[49]:= CurrentValue["TooltipFontFamily"]
Out[49]= "Segoe UI"

Union[
 Flatten[
  Cases[
       Import[#], HoldPattern[CurrentValue[a_]] :> a, Infinity
       ] & /@ FileNames[#] & /@
   {
    FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
      "StyleSheets", "*.nb"}],
    FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
      "TextResources", "*.nb"}],
    FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
      "SystemResources", "*.nb"}]
    },
  2
  ]
 ]

(*
==>
{CommandKey, ControlKey, ControlsFontFamily, ControlsFontSize,
 DefaultButtonSize,
 DefaultNewGraphics, HyperlinkModifierKey, LicenseValid, MenuFontFamily,
 MouseButtonTest, MouseClickCount, MouseOver, NotebookSelected, OptionKey,
 PanelBackground, PanelFontFamily, PanelFontSize, ScreenArea, ShiftKey,
 ToolbarBackground, TooltipFontFamily, TooltipFontSize, TooltipFrameMargins,
 Enabled, Language, {ControlsFontSize, Large}, {ControlsFontSize, Medium},
 {ControlsFontSize, Small}, {SystemColor, DialogText},
 {SystemColor,DialogTextDisabled}, {SystemColor, MenuText},
 {SystemColor, Tooltip}, {SystemColor, TooltipFrame},
 {SystemColor, TooltipText}, {TaggingRules, Highlight},
 {ScreenRectangle, 1, 2}, {ScreenRectangle, 2, 2}}
*)

Syntax::sntufn: Unknown unicode longname NumberComma.

{"Thickness", "Opacity", "Dashing", "FontFamily", "FontSize", "FontSlant",
 "FontWeight", "FontColor", "FontOpacity"}

systemnames = Names["System`*"];
  Select[systemnames, CurrentValue[#] =!= $Failed &];
  CurrentValue /@ % // Short
  (*
  ==> {False, {FrontEnd`FileName[{$UserBaseDirectory, "Autoload"}],  ... }
  *)

{"AltKey", "ByteCount", "CellChangeTimesList", "CellCount", "CellStyleName",
"CodeContext", "CommandKey", "ConnectedControllers", "ControlKey", "ControllerData",
"ControllerState", "ControlsFontFamily", "ControlsFontSize", "CounterValue",
"CurrentFormatTime", "CurrentLocatorPaneThumb", "DefaultButtonSize",
"DefaultHelpViewerWindowMargins", "DefaultHelpViewerWindowSize", "DefaultWindowSize",
"DialogCanClose", "DocumentAndWindowSize", "DocumentSize", "EventAbsoluteTime",
"EventData", "EventKey", "FontAscenderHeight", "FontAxisOffset", "FontCapHeight",
"FontDescenderDepth", "FontLineHeight", "FontLowercaseAscenderHeight", "FontMWidth",
"FontNWidth", "FontThickness", "FontXHeight", "FullScreenArea", "GraphicsSelectionType",
"HasHandwritingInput", "HasSystemFullScreenButton", "HasTouchscreen",
"HyperlinkModifierKey", "InternetConnectionAvailable", "KeyboardKeys",
"LicenseValid", "LocalFileSystemAccessAllowed", "MaxCounterValue",
"MenuFontFamily", "MenuFontSize", "ModifierKeys", "MouseButtons", "MouseButtonTest",
"MouseClickCount", "MouseOver", "MousePosition", "NetworkConnectionAvailable",
"NotebookDirectory", "NotebookEvaluationPending", "NotebookFileName",
"NotebookFullFileName", "NotebookSelected", "OptionKey", "PanelBackground",
"PanelFontFamily", "PanelFontSize", "PluginEnabled", "PluginParameters",
"PreferredHandedness", "PreviousFormatTime", "PrimaryScreenSize", "RightClickData",
"RunningEvaluator", "ScreenArea", "ScreenBitDepth", "ScreenInformation",
"ScreenResolution", "SelectionData", "SelectionOver", "ShiftKey",
"ShutdownSynchronization", "StoredWolframIdCredentials", "StyleDefinitions",
"SynchronizationType", "SyntaxColoringReasons", "SystemColor", "TimeUsed",
"ToolbarBackground", "TooltipFontFamily", "TooltipFontSize", "TooltipFrameMargins",
"TouchPosition", "UserInteractionEnabled", "WindowResolution",
"WolframCloudActivityQueueStatus", "WolframCloudConnected", "WolframCloudFullUserName",
"WolframCloudLoginError", "WolframCloudSyncState", "WolframCloudUILogin",
"WolframCloudUserName", "WolframCloudUserUUID", "WordCount"}

{"AlignmentGuidesEnabled", "AllowDataUpdates", "AllowDocumentationUpdates",
"AllowDownloads", "AutoQuoteCharacters", "BlinkingCellInsertionPoint",
"CaseSensitiveCommandCompletion", "CellChangeTimeMergeInterval", "CodeAssistOptions",
"DebuggerSettings", "DefaultNewGraphics", "DialogSettings", "DisplayImagePixels",
"Graphics3DBoxOptionsClipPlanes", "Graphics3DBoxOptionsClipPlanesStyle",
"Graphics3DBoxOptionsImageSize", "Graphics3DBoxOptionsPlotRange",
"GraphicsBoxOptionsImageSize", "GraphicsBoxOptionsImageSizeRaw", "IsPersistent2DTool",
"MarkerAspectRatio", "MarkerLineThickness", "NotebookSecurityOptions",
"NotebooksMenuHistoryLength", "PasteAutoQuoteCharacters", "PersistentTools",
"PreferencesSettings", "Raster3DBoxOptionsPlotRange",
"Raster3DBoxOptionsPlotRangeClipPlanesStyle", "RasterExploreViewRange", "SelectedTool",
"ShowPredictiveInterface", "TrackCellChangeTimes", "VersionedPreferences",
"WolframCloudSettings", AutoMultiplicationSymbol, AutoNumberFormatting,
FrontEnd`AutoOpenPaclets, AutoStyleOptions, ButtonBoxOptions, cache,
CommonDefaultFormatTypes, ConversionOptions, FrontEnd`Current2DTool, DefaultNewCellStyle,
DigitBlock, DigitBlockMinimum, DragAndDrop, Enabled, Evaluatable, Evaluator,
EvaluatorNames, FindSettings, Graphics3DBoxOptions, HomePage, Language, Magnification,
MessageOptions, NewPrimitiveStyle, NotebookConvertSettings, NotebooksMenu,
NumberMultiplier, NumberPoint, NumberSeparator, option, OutputSizeLimit, PageFooterLines,
PageFooters, PageHeaderLines, PageHeaders, $CellContext`pos$$, PrintAction,
PrintingOptions, PrintingStartingPageNumber, PrintPrecision, PrivateFrontEndOptions,
PrivateNotebookOptions, RenderingOptions, FrontEnd`RightClickData, RulerUnits,
ScreenStyleEnvironment, ShowCellLabel, ShowCursorTracker, ShowGroupOpenCloseIcon,
ShowSyntaxStyles, StyleDefinitions, StyleNameDialogSettings, TaggingRules, Visible,
WindowMargins, WindowSize, WindowStatusArea, WindowTitle}

{"AutoStyleOptions", "FormattingErrorTooltips"}
{"AutoStyleOptions", "HighlightComments"}
{"AutoStyleOptions", "HighlightEmphasizedSyntaxErrors"}
{"AutoStyleOptions", "HighlightExcessArguments"}
{"AutoStyleOptions", "HighlightFormattingErrors"}
{"AutoStyleOptions", "HighlightFunctionLocalVariables"}
{"AutoStyleOptions", "HighlightLocalScopeConflicts"}
{"AutoStyleOptions", "HighlightLocalVariables"}
{"AutoStyleOptions", "HighlightMissingArguments"}
{"AutoStyleOptions", "HighlightOrderOfEvaluationConflicts"}
{"AutoStyleOptions", "HighlightPatternVariables"}
{"AutoStyleOptions", "HighlightStrings"}
{"AutoStyleOptions", "HighlightSymbolShadowing"}
{"AutoStyleOptions", "HighlightSyntaxErrors"}
{"AutoStyleOptions", "HighlightUndefinedSymbols"}
{"AutoStyleOptions", "HighlightUnknownOptions"}
{"AutoStyleOptions", "HighlightUnwantedAssignments"}
{"AutoStyleOptions", "CommentStyle", FontColor}
{"AutoStyleOptions", "EmphasizedSyntaxErrorStyle", Background}
{"AutoStyleOptions", "EmphasizedSyntaxErrorStyle", FontColor}
{"AutoStyleOptions", "EmphasizedSyntaxErrorStyle", FontSize}
{"AutoStyleOptions", "ExcessArgumentStyle", FontColor}
{"AutoStyleOptions", "FunctionLocalVariableStyle", FontColor}
{"AutoStyleOptions", "LocalScopeConflictStyle", FontColor}
{"AutoStyleOptions", "LocalVariableStyle", FontColor}
{"AutoStyleOptions", "MissingArgumentStyle", FontColor}
{"AutoStyleOptions", "OrderOfEvaluationConflictStyle", FontColor}
{"AutoStyleOptions", "PatternVariableStyle", FontColor}
{"AutoStyleOptions", "PatternVariableStyle", FontSlant}
{"AutoStyleOptions", "StringStyle", FontColor}
{"AutoStyleOptions", "SymbolShadowingStyle", FontColor}
{"AutoStyleOptions", "SyntaxErrorStyle", FontColor}
{"AutoStyleOptions", "UndefinedSymbolStyle", FontColor}
{"AutoStyleOptions", "UnknownOptionStyle", FontColor}
{"AutoStyleOptions", "UnwantedAssignmentStyle", FontColor}


{"ButtonBoxOptions", ButtonData}


{"ByteCount", $CellContext`selectionOnly$$}


{"CellChangeTimesList", $CellContext`selectionOnly$$}


{"CellCount", False}
{"CellCount", True}


{"CodeAssistOptions", "AutoConvertEnable"}
{"CodeAssistOptions", "AutoPopupDelay"}
{"CodeAssistOptions", "AutoPopupEnable"}
{"CodeAssistOptions", "DynamicHighlighting"}
{"CodeAssistOptions", "FloatingElementDelay"}
{"CodeAssistOptions", "FloatingElementEnable"}
{"CodeAssistOptions", "HeadHighlightStyle", Background}
{"CodeAssistOptions", "MatchHighlightStyle", Background}


{"CommonDefaultFormatTypes", "Input"}
{"CommonDefaultFormatTypes", "Output"}


{"ControllerData", {"Gamepad", "Joystick", "Multi-AxisController"}}


{"ControlsFontSize", Large}
{"ControlsFontSize", Medium}
{"ControlsFontSize", Small}
{"ControlsFontSize", Tiny}


{"ConversionOptions", "ExportOptions", "BMP"}
{"ConversionOptions", "ExportOptions", "EPS"}
{"ConversionOptions", "ExportOptions", "GIF"}
{"ConversionOptions", "ExportOptions", "JPEG"}
{"ConversionOptions", "ExportOptions", "JPEG2000"}
{"ConversionOptions", "ExportOptions", "Package"}
{"ConversionOptions", "ExportOptions", "PDF"}
{"ConversionOptions", "ExportOptions", "PNM"}
{"ConversionOptions", "ExportOptions", "SVG"}
{"ConversionOptions", "ExportOptions", "TeX"}
{"ConversionOptions", "ExportOptions", "TIFF"}
{"ConversionOptions", "ExportOptions", "XHTML"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML"}
{"ConversionOptions", "ImportOptions", "GIF"}
{"ConversionOptions", "ImportOptions", "JPEG"}
{"ConversionOptions", "ImportOptions", "Package"}
{"ConversionOptions", "ImportOptions", "PDF"}
{"ConversionOptions", "ImportOptions", "Text"}
{"ConversionOptions", "ImportOptions", "TIFF"}
{"ConversionOptions", "ExportOptions", "GIF", "Background"}
{"ConversionOptions", "ExportOptions", "GIF", "Transparency"}
{"ConversionOptions", "ExportOptions", "JPEG2000", "ImageEncoding"}
{"ConversionOptions", "ExportOptions", "TIFF", "ColorSeparation"}
{"ConversionOptions", "ExportOptions", "TIFF", "DifferencePredictor"}
{"ConversionOptions", "ExportOptions", "XHTML", "ConvertClosed"}
{"ConversionOptions", "ExportOptions", "XHTML", "ConvertReverseClosed"}
{"ConversionOptions", "ExportOptions", "XHTML", "CSSFile"}
{"ConversionOptions", "ExportOptions", "XHTML", "CSSInclude"}
{"ConversionOptions", "ExportOptions", "XHTML", "CSSRadio"}
{"ConversionOptions", "ExportOptions", "XHTML", "MathOutput"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML", "ConvertClosed"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML", "ConvertReverseClosed"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML", "CSSFile"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML", "CSSInclude"}
{"ConversionOptions", "ExportOptions", "XHTMLMathML", "CSSRadio"}
{"ConversionOptions", "ImportOptions", "PDF", "Editable"}
{"ConversionOptions", "ImportOptions", "PDF", "Pages"}
{"ConversionOptions", "ImportOptions", "Text", "ReadingType"}


{"CounterValue", "SlideShowNavigationBar"}


{"DebuggerSettings", "BreakOnAllMessages"}
{"DebuggerSettings", "BreakOnAsserts"}
{"DebuggerSettings", "BreakpointsGroup"}
{"DebuggerSettings", "DebuggerEnabled"}
{"DebuggerSettings", "HighlightBreakpoints"}
{"DebuggerSettings", "HighlightEvaluatorPosition"}
{"DebuggerSettings", "HighlightStackFrames"}
{"DebuggerSettings", "MessageBreakpointsGroup"}
{"DebuggerSettings", "ShowBreakpoints"}
{"DebuggerSettings", "ShowStack"}
{"DebuggerSettings", "WatchpointsGroup"}
{"DebuggerSettings", "BreakpointStyle", Background}
{"DebuggerSettings", "BreakpointStyle", FontColor}
{"DebuggerSettings", "EvaluatorPositionHighlightStyle", Background}
{"DebuggerSettings", "EvaluatorPositionHighlightStyle", FontColor}
{"DebuggerSettings", "StackHighlightStyle", Background}
{"DebuggerSettings", "StackHighlightStyle", FontColor}


{"DialogSettings", "Install", "Type"}


{"DigitBlock", 1}
{"DigitBlock", 2}


{"DigitBlockMinimum", 1}
{"DigitBlockMinimum", 2}


{"FindSettings", "FindBoxes"}
{"FindSettings", "FindHistory"}
{"FindSettings", "IgnoreCase"}
{"FindSettings", "ReplaceBoxes"}
{"FindSettings", "ReplaceHistory"}
{"FindSettings", "WholeWord"}
{"FindSettings", "Wraparound"}
{"FindSettings", WindowMargins}
{"FindSettings", WindowOpacity}
{"FindSettings", WindowSize}


{"Graphics3DBoxOptions", "RotationAction"}


{"Graphics3DBoxOptionsClipPlanes", $CellContext`i$}
{"Graphics3DBoxOptionsClipPlanes", $CellContext`j$}
{"Graphics3DBoxOptionsClipPlanes", $CellContext`i$, 4}
{"Graphics3DBoxOptionsClipPlanes", $CellContext`j$, 4}


{"Graphics3DBoxOptionsClipPlanesStyle", $CellContext`i$}
{"Graphics3DBoxOptionsClipPlanesStyle", $CellContext`j$}


{"MaxCounterValue", "SlideShowNavigationBar"}


{"MessageOptions", "CompatibilityToolWarning"}
{"MessageOptions", "ConsoleMessageAction"}
{"MessageOptions", "ErrorAction"}
{"MessageOptions", "KernelMessageAction"}
{"MessageOptions", "WarningAction"}


{"ModifierKeys", "Command"}


{"NewPrimitiveStyle", Arrowheads}
{"NewPrimitiveStyle", Background}
{"NewPrimitiveStyle", CapForm}
{"NewPrimitiveStyle", Dashing}
{"NewPrimitiveStyle", DrawEdges}
{"NewPrimitiveStyle", DrawFrontFaces}
{"NewPrimitiveStyle", EdgeCapForm}
{"NewPrimitiveStyle", EdgeColor}
{"NewPrimitiveStyle", EdgeDashing}
{"NewPrimitiveStyle", EdgeJoinForm}
{"NewPrimitiveStyle", EdgeOpacity}
{"NewPrimitiveStyle", EdgeThickness}
{"NewPrimitiveStyle", FontColor}
{"NewPrimitiveStyle", FontFamily}
{"NewPrimitiveStyle", FontOpacity}
{"NewPrimitiveStyle", FontSize}
{"NewPrimitiveStyle", FontSlant}
{"NewPrimitiveStyle", FontWeight}
{"NewPrimitiveStyle", FrontFaceColor}
{"NewPrimitiveStyle", FrontFaceOpacity}
{"NewPrimitiveStyle", GraphicsColor}
{"NewPrimitiveStyle", JoinForm}
{"NewPrimitiveStyle", LineColor}
{"NewPrimitiveStyle", LineOpacity}
{"NewPrimitiveStyle", Opacity}
{"NewPrimitiveStyle", PointSize}
{"NewPrimitiveStyle", TextAlignment}
{"NewPrimitiveStyle", TextJustification}
{"NewPrimitiveStyle", Thickness}
{"NewPrimitiveStyle", FontVariations, "Underline"}
{"NewPrimitiveStyle", InsetBoxOptions, Alignment}
{"NewPrimitiveStyle", RectangleBoxOptions, RoundingRadius}
{"NewPrimitiveStyle", InsetBoxOptions, Alignment, 2}


{"NotebookConvertSettings", "GenerateBitmapCaches"}
{"NotebookConvertSettings", "InputToStandardForm"}
{"NotebookConvertSettings", "OutputToStandardForm"}
{"NotebookConvertSettings", "PreserveStyleSheet"}


{"NotebookSecurityOptions", "TrustByDefault"}
{"NotebookSecurityOptions", str}


{"PageFooterLines", 1}
{"PageFooterLines", 2}
{"PageFooterLines", $CellContext`currentPage$$}


{"PageFooters", 1, 1}
{"PageFooters", 1, 2}
{"PageFooters", 1, 3}
{"PageFooters", 2, 1}
{"PageFooters", 2, 2}
{"PageFooters", 2, 3}
{"PageFooters", 2, $CellContext`currentPosition$$[2, "Footer"]}
    {"PageFooters", $CellContext`currentPage$$, $CellContext`currentPosition$$[$CellContext`currentPage$$, "Footer"]}


{"PageHeaderLines", 1}
{"PageHeaderLines", 2}
{"PageHeaderLines", $CellContext`currentPage$$}


{"PageHeaders", 1, 1}
{"PageHeaders", 1, 2}
{"PageHeaders", 1, 3}
{"PageHeaders", 2, 1}
{"PageHeaders", 2, 2}
{"PageHeaders", 2, 3}
{"PageHeaders", 2, $CellContext`currentPosition$$[2, "Header"]}
    {"PageHeaders", $CellContext`currentPage$$, $CellContext`currentPosition$$[$CellContext`currentPage$$, "Header"]}


{"PreferencesSettings", "Page"}
{"PreferencesSettings", "UseTextFormattingWhenConvertingInput"}
{"PreferencesSettings", "UseTextFormattingWhenConvertingOutput"}


{"PrintingOptions", "FacingPages"}
{"PrintingOptions", "FirstPageFace"}
{"PrintingOptions", "FirstPageFooter"}
{"PrintingOptions", "FirstPageHeader"}
{"PrintingOptions", "OpacityRenderingMethod"}
{"PrintingOptions", "RasterizationResolution"}
{"PrintingOptions", "VertexColorRenderingMethod"}


{"PrivateFrontEndOptions", "LastRegistrationReminderDate"}
{"PrivateFrontEndOptions", "LicensesAgreed"}
{"PrivateFrontEndOptions", "ShowAtStartup"}
{"PrivateFrontEndOptions", "WolframAlphaSettings"}
{"PrivateFrontEndOptions", "WolframAlphaSettings", "BaseURL"}
{"PrivateFrontEndOptions", "WolframAlphaSettings", "SendMathematicaSessionInfo"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "ArrowsOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "FillOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "OperationsOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "PointsOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "RectanglesOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "SettingsOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "StrokeOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "TextOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", "ToolsOpener"}
{"PrivateFrontEndOptions", "DialogSettings", "DrawingTools", WindowMargins}
{"PrivateFrontEndOptions", "DialogSettings", "HeadersFooters", "DateFormat"}
{"PrivateFrontEndOptions", "DialogSettings", "HeadersFooters", "Dialogs"}
{"PrivateFrontEndOptions", "DialogSettings", "HeadersFooters", "PageNumberFormat"}
{"PrivateFrontEndOptions", "DialogSettings", "InsertCitation", WindowMargins}
{"PrivateFrontEndOptions", "DialogSettings", "InsertCitation", WindowSize}
{"PrivateFrontEndOptions", "DialogSettings", "InsertCitationNote", WindowMargins}
{"PrivateFrontEndOptions", "DialogSettings", "InsertCitationNote", WindowSize}
{"PrivateFrontEndOptions", "DialogSettings", "Install", "Source"}
{"PrivateFrontEndOptions", "DialogSettings", "Install", "Type"}
{"PrivateFrontEndOptions", "InterfaceSettings", "ImageEditingToolbar", "QueryHistory"}
{"PrivateFrontEndOptions", "DialogSettings", "Preferences", "SubTabs", "Appearance"}
{"PrivateFrontEndOptions", "DialogSettings", "Preferences", "SubTabs", "SyntaxColoring"}


{"PrivateNotebookOptions", "FinalWindowPrompt"}
{"PrivateNotebookOptions", "JournalStyle"}
{"PrivateNotebookOptions", "NoteStyle"}
{"PrivateNotebookOptions", "SafeFileOpen"}
{"PrivateNotebookOptions", "VersionedStylesheet"}


{"Raster3DBoxOptionsPlotRange", $CellContext`i$}
{"Raster3DBoxOptionsPlotRange", $CellContext`i$, 1}
{"Raster3DBoxOptionsPlotRange", $CellContext`i$, 2}


{"RenderingOptions", "HardwareAntialiasingQuality"}


{"SystemColor", "DialogText"}
{"SystemColor", "DialogTextDisabled"}
{"SystemColor", "Menu"}
{"SystemColor", "MenuText"}
{"SystemColor", "Tooltip"}
{"SystemColor", "TooltipFrame"}
{"SystemColor", "TooltipText"}


{"TaggingRules", "ActivationState"}
{"TaggingRules", "ColorType"}
{"TaggingRules", "DefaultWindowSize"}
{"TaggingRules", "DisableController"}
{"TaggingRules", "ErrorMessage"}
{"TaggingRules", "ExampleCounter"}
{"TaggingRules", "FoundExpression"}
{"TaggingRules", "Highlight"}
{"TaggingRules", "Image3DEditor"}
{"TaggingRules", "ImageEditor"}
{"TaggingRules", "index"}
{"TaggingRules", "InputNotebook"}
{"TaggingRules", "length"}
{"TaggingRules", "NotebookID"}
{"TaggingRules", ScrollPosition}
{"TaggingRules", WindowSize}
{"TaggingRules", "SlideshowSettings", "Toolbar"}
{"TaggingRules", "SlideshowSettings", "WindowElements"}


{"WindowSize", 1}
{"WindowSize", 2}


{"WolframCloudSettings", "ActivityMonitorWindowMargins"}
{"WolframCloudSettings", "ActivityMonitorWindowSize"}
{"WolframCloudSettings", "OpenDialogWindowMargins"}
{"WolframCloudSettings", "OpenDialogWindowSize"}
{"WolframCloudSettings", "SaveDialogWindowMargins"}
{"WolframCloudSettings", "SaveDialogWindowSize"}

fnames = FileNames[
   "*.nb" |
    "*.tr", {FileNameJoin[{$InstallationDirectory, "SystemFiles",
      "FrontEnd", "StyleSheets"}],
    FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
      "TextResources"}],
    FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
      "SystemResources"}]}, Infinity];

fimps = Import[#, "Text"] & /@ fnames;

DeleteDuplicates@
     Flatten@StringCases[fimps,
       Shortest[
        "CurrentValue[" ~~ (i___ /;
           SameQ @@ (StringCount[i, #] & /@ {"[", "]"})) ~~ "]"]] //
    StringReplace[#, Whitespace -> ""] & //
   MakeExpression[#, StandardForm][[1, 1]] & /@ # & //
  DeleteDuplicates//Sort

{
 {"CellCount"},
 {"CommandKey"},
 {"ControlKey"},
 {"ControlsFontFamily"},
 {"ControlsFontSize"},
 {"CurrentFormatTime"},
 {"DefaultButtonSize"},
 {"DefaultNewGraphics"},
 {"GraphicsBoxOptionsImageSizeRaw"},
 {"HyperlinkModifierKey"},
 {"LicenseValid"},
 {"Magnification"},
 {"MenuFontFamily"},
 {"MouseButtonTest"},
 {"MouseClickCount"},
 {"MouseOver"},
 {"MousePosition"},
 {"NotebookFileName"},
 {"NotebookSelected"},
 {"OptionKey"},
 {"PanelBackground"},
 {"PanelFontFamily"},
 {"PanelFontSize"},
 {"PluginEnabled"},
 {"PreviousFormatTime"},
 {"ScreenArea"},
 {"SelectionData"},
 {"SelectionOver"},
 {"ShiftKey"},
 {"ToolbarBackground"},
 {"TooltipFontFamily"},
 {"TooltipFontSize"},
 {"TooltipFrameMargins"},
 {"WindowSize"},
 {dialog},
 {Enabled},
 {HomePage},
 {Inherited},
 {$CellContext`inputnb$$},
 {Language},
 {Magnification},
 {nb},
 {$CellContext`nb$},
 {$CellContext`nb$$},
 {FrontEnd`SelectionObject},
 {target},
 {WindowFrame},
 {WindowSize},
 {WindowTitle},
 {FrontEnd`$ActivationDialog},
 {$Failed},
 {FrontEnd`$FrontEnd},
 {FrontEnd`ButtonNotebook[]},
 {FrontEnd`EvaluationNotebook[]},
 {FrontEndObject[
   LinkObject["2t2_shm", 1, 1]]},
 {FrontEnd`InputNotebook[]},
 {{"ControllerData", {"Gamepad", "Joystick", "Multi-AxisController"}}},
 {{"ControlsFontSize", Large}},
 {{"ControlsFontSize", Medium}},
 {{"ControlsFontSize", Small}},
 {{"ControlsFontSize", Tiny}},
 {{"ControlsFontSize", #5}},
 {{"CounterValue", "SlideShowNavigationBar"}},
 {{"MaxCounterValue", "SlideShowNavigationBar"}},
 {{"ModifierKeys", "Command"}},
 {{"SystemColor", "DialogText"}},
 {{"SystemColor", "DialogTextDisabled"}},
 {{"SystemColor", "MenuText"}},
 {{"SystemColor", "Tooltip"}},
 {{"SystemColor", "TooltipFrame"}},
 {{"SystemColor", "TooltipText"}},
 {{ButtonBoxOptions, ButtonData}},
 {{TaggingRules, "Highlight"}},
 {{WindowSize, 1}},
 {{WindowSize, 2}},
 {{"ScreenRectangle", 1, 2}},
 {{"ScreenRectangle", 2, 2}},
 {{ConversionOptions, "ImportOptions", "PDF", "Editable"}},
 {{ConversionOptions, "ImportOptions", "PDF", "Pages"}},
 {NotebookObject[
   FrontEndObject[
    LinkObject["2t2_shm", 1, 1]], 193]},
 {target_},
 {#1}
}

InternalFiles[namePattern_,
  directoryExtensions___,depth:_Integer|[Infinity]:[Infinity]]:=
    FileNames[namePattern,
        FileNameJoin@{
            $InstallationDirectory,
            directoryExtensions
            },
        depth];

expressionsSearch[files_, pat_] :=
  Table[
    f -> Quiet@
      Cases[
       Switch[FileExtension@f,
        "m" | "wl",
        Import[f, "HeldExpressions"],
        _,
        Import[f]
        ],
       pat,
       [Infinity]
       ],
    {f, Replace[files,
      Except@_List :> InternalFiles[files]
      ]}
    ] // DeleteDuplicates;

curValsExprs =
  expressionsSearch["*.m" | "*.nb",
   c : (_CurrentValue) :> Hold[c]];

Hold[CurrentValue["AllowDownloads"]],
Hold[CurrentValue["AltKey"]],
Hold[CurrentValue["CommandKey"]],
Hold[CurrentValue["ControlKey"]],
Hold[CurrentValue["ControlsFontFamily"]],
Hold[CurrentValue["ControlsFontSize"]],
Hold[CurrentValue["CurrentFormatTime"]],
Hold[CurrentValue["CurrentLocatorPaneThumb"]],
Hold[CurrentValue["DefaultButtonSize"]],
Hold[CurrentValue["DefaultNewGraphics"]],
Hold[CurrentValue["DynamicEvaluation"]],
Hold[CurrentValue["Evaluator"]],
Hold[CurrentValue["FontCapHeight"]],
Hold[CurrentValue["FontMWidth"]],
Hold[CurrentValue["HyperlinkModifierKey"]],
Hold[CurrentValue["InternetConnectionAvailable"]],
Hold[CurrentValue["LicenseValid"]],
Hold[CurrentValue["LocalFileSystemAccessAllowed"]],
Hold[CurrentValue["Magnification"]],
Hold[CurrentValue["MenuFontFamily"]],
Hold[CurrentValue["MenuFontSize"]],
Hold[CurrentValue["ModifierKeys"]],
Hold[CurrentValue["MouseButtons"]],
Hold[CurrentValue["MouseButtonTest"]],
Hold[CurrentValue["MouseClickCount"]],
Hold[CurrentValue["MouseOver"]],
Hold[CurrentValue["NotebookSelected"]],
Hold[CurrentValue["OptionKey"]],
Hold[CurrentValue["PanelBackground"]],
Hold[CurrentValue["PanelFontFamily"]],
Hold[CurrentValue["PanelFontSize"]],
Hold[CurrentValue["PluginEnabled"]],
Hold[CurrentValue["PreviousFormatTime"]],
Hold[CurrentValue["RunningEvaluator"]],
Hold[CurrentValue["SelectionData"]],
Hold[CurrentValue["SelectionOver"]],
Hold[CurrentValue["ShiftKey"]],
Hold[CurrentValue["SynchronizationType"]],
Hold[CurrentValue["SynchronousEvaluation"]],
Hold[CurrentValue["ToolbarBackground"]],
Hold[CurrentValue["TooltipFontFamily"]],
Hold[CurrentValue["TooltipFontSize"]],
Hold[CurrentValue["TooltipFrameMargins"]],
Hold[CurrentValue["UserInteractionEnabled"]],
Hold[CurrentValue["WindowSize"]],
Hold[CurrentValue["WolframCloudActivityQueueStatus"]],
Hold[CurrentValue["WolframCloudConnected"]],
Hold[CurrentValue["WolframCloudLoginError"]],
Hold[CurrentValue["WolframCloudUILogin"]],
Hold[CurrentValue[Enabled]],
Hold[CurrentValue[Evaluatable]],
Hold[CurrentValue[FontColor]],
Hold[CurrentValue[Language]]

Hold[CurrentValue[{"ControllerData",{"Gamepad","Joystick","Multi-Axis Controller"}}]],
Hold[CurrentValue[{"ControlsFontSize",Large}]],
Hold[CurrentValue[{"ControlsFontSize",Medium}]],
Hold[CurrentValue[{"ControlsFontSize",Small}]],
Hold[CurrentValue[{"SystemColor","DialogText"}]],
Hold[CurrentValue[{"SystemColor","DialogTextDisabled"}]],
Hold[CurrentValue[{"SystemColor","Menu"}]],
Hold[CurrentValue[{"SystemColor","MenuText"}]],
Hold[CurrentValue[{"SystemColor","Tooltip"}]],
Hold[CurrentValue[{"SystemColor","TooltipFrame"}]],
Hold[CurrentValue[{"SystemColor","TooltipText"}]],
Hold[CurrentValue[{GraphicsBoxOptions,AxesStyle}]],
Hold[CurrentValue[{GraphicsBoxOptions,LabelStyle}]],
Hold[CurrentValue[{GraphicsBoxOptions,TicksStyle}]],
Hold[CurrentValue[{StyleDefinitions,"EntityFrame"}]],
Hold[CurrentValue[{StyleDefinitions,"EntityFrameless"}]],
Hold[CurrentValue[{StyleDefinitions,"GeneralizedEntityToggleLabeled"}]],
Hold[CurrentValue[{StyleHints,"CodeFont"}]],
Hold[CurrentValue[{TaggingRules,"ModificationHighlight"}]],
Hold[CurrentValue[{"MousePosition","Graphics",{0,0}}]],
Hold[CurrentValue[{ScreenRectangle,1,2}]],
Hold[CurrentValue[{ScreenRectangle,2,2}]],
Hold[CurrentValue[{TaggingRules,"values","subvalues"}]]

Hold[CurrentValue[FEObject,"3DPrintPreviewerApplication"]],
Hold[CurrentValue[FEObject,"AddOnHelpPath"]],
Hold[CurrentValue[FEObject,"AlignmentGuidesEnabled"]],
Hold[CurrentValue[FEObject,"AllowDataUpdates"]],
Hold[CurrentValue[FEObject,"AllowDocumentationUpdates"]],
Hold[CurrentValue[FEObject,"AllowExternalChannelFunctions"]],
Hold[CurrentValue[FEObject,"AutoQuoteCharacters"]],
Hold[CurrentValue[FEObject,"CaseSensitiveCommandCompletion"]],
Hold[CurrentValue[FEObject,"CellChangeTimeMergeInterval"]],
Hold[CurrentValue[FEObject,"CodeContext"]],
Hold[CurrentValue[FEObject,"Current2DTool"]],
Hold[CurrentValue[FEObject,"DialogCanClose"]],
Hold[CurrentValue[FEObject,"DisplayImagePixels"]],
Hold[CurrentValue[FEObject,"FontSize"]],
Hold[CurrentValue[FEObject,"Graphics3DBoxOptionsClipPlanes"]],
Hold[CurrentValue[FEObject,"Graphics3DBoxOptionsClipPlanesStyle"]],
Hold[CurrentValue[FEObject,"Graphics3DBoxOptionsImageSize"]],
Hold[CurrentValue[FEObject,"Graphics3DBoxOptionsPlotRange"]],
Hold[CurrentValue[FEObject,"GraphicsBoxOptionsImageSize"]],
Hold[CurrentValue[FEObject,"IsPersistent2DTool"]],
Hold[CurrentValue[FEObject,"Language"]],
Hold[CurrentValue[FEObject,"MarkerAspectRatio"]],
Hold[CurrentValue[FEObject,"MarkerLineThickness"]],
Hold[CurrentValue[FEObject,"NotebooksMenuHistoryLength"]],
Hold[CurrentValue[FEObject,"PasteAutoQuoteCharacters"]],
Hold[CurrentValue[FEObject,"PersistentTools"]],
Hold[CurrentValue[FEObject,"Raster3DBoxOptionsPlotRange"]],
Hold[CurrentValue[FEObject,"Raster3DBoxOptionsPlotRangeClipPlanesStyle"]],
Hold[CurrentValue[FEObject,"RasterExploreViewRange"]],
Hold[CurrentValue[FEObject,"SelectedTool"]],
Hold[CurrentValue[FEObject,"ShowAutoSpellCheck"]],
Hold[CurrentValue[FEObject,"ShowPredictiveInterface"]],
Hold[CurrentValue[FEObject,"SyntaxColoringReasons"]],
Hold[CurrentValue[FEObject,"TrackCellChangeTimes"]],
Hold[CurrentValue[FEObject,"VersionedPreferences"]],
Hold[CurrentValue[FEObject,AutoMultiplicationSymbol]],
Hold[CurrentValue[FEObject,AutoNumberFormatting]],
Hold[CurrentValue[FEObject,Background]],
Hold[CurrentValue[FEObject,CellID]],
Hold[CurrentValue[FEObject,CellTags]],
Hold[CurrentValue[FEObject,DefaultNewCellStyle]],
Hold[CurrentValue[FEObject,Deployed]],
Hold[CurrentValue[FEObject,DockedCells]],
Hold[CurrentValue[FEObject,DynamicUpdating]],
Hold[CurrentValue[FEObject,Magnification]],
Hold[CurrentValue[FEObject,NotebooksMenu]],
Hold[CurrentValue[FEObject,NumberMultiplier]],
Hold[CurrentValue[FEObject,NumberPoint]],
Hold[CurrentValue[FEObject,NumberSeparator]],
Hold[CurrentValue[FEObject,OutputSizeLimit]],
Hold[CurrentValue[FEObject,PrintAction]],
Hold[CurrentValue[FEObject,PrintingStartingPageNumber]],
Hold[CurrentValue[FEObject,PrintPrecision]],
Hold[CurrentValue[FEObject,resType]],
Hold[CurrentValue[FEObject,RulerUnits]],
Hold[CurrentValue[FEObject,ScreenStyleEnvironment]],
Hold[CurrentValue[FEObject,ShowCellLabel]],
Hold[CurrentValue[FEObject,ShowGroupOpenCloseIcon]],
Hold[CurrentValue[FEObject,ShowSelection]],
Hold[CurrentValue[FEObject,ShowSyntaxStyles]],
Hold[CurrentValue[FEObject,StyleDefinitions]],
Hold[CurrentValue[FEObject,StyleNameDialogSettings]],
Hold[CurrentValue[FEObject,TransitionEffect]],
Hold[CurrentValue[FEObject,Visible]],
Hold[CurrentValue[FEObject,WindowElements]],
Hold[CurrentValue[FEObject,WindowMargins]],
Hold[CurrentValue[FEObject,WindowOpacity]],
Hold[CurrentValue[FEObject,WindowSize]],
Hold[CurrentValue[FEObject,WindowStatusArea]],
Hold[CurrentValue[FEObject,WindowTitle]]

Hold[CurrentValue[FEObject,{"AutoStyleOptions",_}]],
Hold[CurrentValue[FEObject,{"ByteCount",_}]],
Hold[CurrentValue[FEObject,{"CellChangeTimesList",_}]],
Hold[CurrentValue[FEObject,{"CellCount",_}]],
Hold[CurrentValue[FEObject,{"CodeAssistOptions",_}]],
Hold[CurrentValue[FEObject,{"DebuggerSettings",_}]],
Hold[CurrentValue[FEObject,{"Graphics3DBoxOptionsClipPlanes",_}]],
Hold[CurrentValue[FEObject,{"Graphics3DBoxOptionsClipPlanesStyle",_}]],
Hold[CurrentValue[FEObject,{"NotebookSecurityOptions",_}]],
Hold[CurrentValue[FEObject,{"PreferencesSettings",_}]],
Hold[CurrentValue[FEObject,{"PrintingOptions",_}]],
Hold[CurrentValue[FEObject,{"Raster3DBoxOptionsPlotRange",_}]],
Hold[CurrentValue[FEObject,{"Raster3DBoxOptionsPlotRangeClipPlanesStyle",_}]],
Hold[CurrentValue[FEObject,{"WolframCloudSettings",_}]],
Hold[CurrentValue[FEObject,{AutoStyleOptions,_}]],
Hold[CurrentValue[FEObject,{CellBracketOptions,_}]],
Hold[CurrentValue[FEObject,{CommonDefaultFormatTypes,_}]],
Hold[CurrentValue[FEObject,{DigitBlock,_}]],
Hold[CurrentValue[FEObject,{DigitBlockMinimum,_}]],
Hold[CurrentValue[FEObject,{FindSettings,_}]],
Hold[CurrentValue[FEObject,{Graphics3DBoxOptions,_}]],
Hold[CurrentValue[FEObject,{MessageOptions,_}]],
Hold[CurrentValue[FEObject,{NewPrimitiveStyle,_}]],
Hold[CurrentValue[FEObject,{NotebookConvertSettings,_}]],
Hold[CurrentValue[FEObject,{PageFooterLines,_}]],
Hold[CurrentValue[FEObject,{PageHeaderLines,_}]],
Hold[CurrentValue[FEObject,{PrintingOptions,_}]],
Hold[CurrentValue[FEObject,{PrivateFrontEndOptions,_}]],
Hold[CurrentValue[FEObject,{PrivateNotebookOptions,_}]],
Hold[CurrentValue[FEObject,{RenderingOptions,_}]],
Hold[CurrentValue[FEObject,{TaggingRules,_}]],
Hold[CurrentValue[FEObject,{TranslationOptions,_}]],
Hold[CurrentValue[FEObject,{"DialogSettings",_,_}]],
Hold[CurrentValue[FEObject,{CellFrameLabels,_,_}]],
Hold[CurrentValue[FEObject,{ConversionOptions,_,_}]],
Hold[CurrentValue[FEObject,{PageFooters,_,_}]],
Hold[CurrentValue[FEObject,{PageHeaders,_,_}]]

SEImportCode[url_]:=
 StringCases[Import[url,"Text"],("<code>" ~~ c : Shortest[__] ~~ "</code>" :> c)]

$ cd /usr/local/Wolfram/Mathematica/11.0
$ cd SystemFiles/FrontEnd/Binaries/Linux-x86-64
$ strings Mathematica | grep 'CurrentValue'

FrontEnd`AbsoluteCurrentValue
FrontEnd`CurrentValue
FrontEnd`Private`SetCurrentValue
FrontEnd`CurrentValue`AltKey
FrontEnd`CurrentValue`CurrentLocatorPaneThumb
FrontEnd`CurrentValue`EventAbsoluteTime
FrontEnd`CurrentValue`EventData
FrontEnd`CurrentValue`ModifierKeys
FrontEnd`CurrentValue`ShiftKey
FrontEnd`CurrentValue`ControlKey
FrontEnd`CurrentValue`CommandKey
FrontEnd`CurrentValue`OptionKey
FrontEnd`CurrentValue`HyperlinkModifierKey
FrontEnd`CurrentValue`MousePosition
FrontEnd`CurrentValue`TouchPosition
FrontEnd`CurrentValue`MouseButtons
FrontEnd`CurrentValue`MouseButtonTest
FrontEnd`CurrentValue`MouseClickCount
FrontEnd`CurrentValue`EventKey
FrontEnd`CurrentValue`MouseOver
FrontEnd`CurrentValue`KeyboardKeys
FrontEnd`CurrentValue`RightClickData
FrontEnd`CurrentValue`SelectionData
FrontEnd`CurrentValue`GraphicsSelectionType
FrontEnd`CurrentValue`SelectionOver
FrontEnd`CurrentValue`NotebookFileName
FrontEnd`CurrentValue`NotebookFullFileName
FrontEnd`CurrentValue`NotebookDirectory
FrontEnd`CurrentValue`NotebookSelected
FrontEnd`CurrentValue`RunningEvaluator
FrontEnd`CurrentValue`NotebookModified
FrontEnd`CurrentValue`FontThickness
FrontEnd`CurrentValue`FontMWidth
FrontEnd`CurrentValue`FontNWidth
FrontEnd`CurrentValue`FontXHeight
FrontEnd`CurrentValue`FontAxisOffset
FrontEnd`CurrentValue`FontLineHeight
FrontEnd`CurrentValue`FontCapHeight
FrontEnd`CurrentValue`FontAscenderHeight
FrontEnd`CurrentValue`FontLowercaseAscenderHeight
FrontEnd`CurrentValue`FontDescenderDepth
FrontEnd`CurrentValue`CellStyleName
FrontEnd`CurrentValue`DocumentSize
FrontEnd`CurrentValue`DocumentAndWindowSize
FrontEnd`CurrentValue`ControlsFontFamily
FrontEnd`CurrentValue`ControlsFontSize
FrontEnd`CurrentValue`PanelFontFamily
FrontEnd`CurrentValue`PanelFontSize
FrontEnd`CurrentValue`PanelBackground
FrontEnd`CurrentValue`ToolbarBackground
FrontEnd`CurrentValue`TooltipFontFamily
FrontEnd`CurrentValue`TooltipFontSize
FrontEnd`CurrentValue`TooltipFrameMargins
FrontEnd`CurrentValue`MenuFontFamily
FrontEnd`CurrentValue`MenuFontSize
FrontEnd`CurrentValue`SystemColor
FrontEnd`CurrentValue`PrimaryScreenSize
FrontEnd`CurrentValue`DefaultWindowSize
FrontEnd`CurrentValue`DefaultHelpViewerWindowSize
FrontEnd`CurrentValue`DefaultHelpViewerWindowMargins
FrontEnd`CurrentValue`HasSystemFullScreenButton
FrontEnd`CurrentValue`CellCount
FrontEnd`CurrentValue`WordCount
FrontEnd`CurrentValue`ByteCount
FrontEnd`CurrentValue`CellChangeTimesList
FrontEnd`CurrentValue`SyntaxColoringReasons
FrontEnd`CurrentValue`CodeContext
FrontEnd`CurrentValue`TimeUsed
FrontEnd`CurrentValue`CounterValue
FrontEnd`CurrentValue`MaxCounterValue
FrontEnd`CurrentValue`StyleDefinitions
FrontEnd`CurrentValue`DefaultButtonSize
FrontEnd`CurrentValue`ConnectedControllers
FrontEnd`CurrentValue`ControllerState
FrontEnd`CurrentValue`ControllerData
FrontEnd`CurrentValue`CurrentFormatTime
FrontEnd`CurrentValue`PreviousFormatTime
FrontEnd`CurrentValue`PreferredHandedness
FrontEnd`CurrentValue`HasTouchscreen
FrontEnd`CurrentValue`HasHandwritingInput
FrontEnd`CurrentValue`NotebookEvaluationPending
FrontEnd`CurrentValue`UserInteractionEnabled
FrontEnd`CurrentValue`PluginEnabled
FrontEnd`CurrentValue`PluginParameters
FrontEnd`CurrentValue`ScreenInformation
FrontEnd`CurrentValue`ScreenArea
FrontEnd`CurrentValue`FullScreenArea
FrontEnd`CurrentValue`ScreenBitDepth
FrontEnd`CurrentValue`ScreenResolution
FrontEnd`CurrentValue`WindowResolution
FrontEnd`CurrentValue`NetworkConnectionAvailable
FrontEnd`CurrentValue`InternetConnectionAvailable
FrontEnd`CurrentValue`ShutdownSynchronization
FrontEnd`CurrentValue`SynchronizationType
FrontEnd`CurrentValue`WolframCloudSyncState
FrontEnd`CurrentValue`WolframCloudActivityQueueStatus
FrontEnd`CurrentValue`WolframCloudUILogin
FrontEnd`CurrentValue`StoredWolframIdCredentials
FrontEnd`CurrentValue`WolframCloudConnected
FrontEnd`CurrentValue`WolframCloudUserName
FrontEnd`CurrentValue`WolframCloudFullUserName
FrontEnd`CurrentValue`WolframCloudUserUUID
FrontEnd`CurrentValue`WolframCloudLoginError
FrontEnd`CurrentValue`PendingWolframCloudTasks
FrontEnd`CurrentValue`DialogCanClose
FrontEnd`CurrentValue`LocalFileSystemAccessAllowed
FrontEnd`CurrentValue`LicenseValid
FrontEnd`CurrentValue`ImageSizeMultiplier

Select[
  Flatten@
   FrontEndExecute[FrontEnd`NeedCurrentFrontEndSymbolsPacket[]][[1]],
  Not@
    MatchQ[
     FrontEndExecute@
      FrontEnd`Value[FrontEnd`CurrentValue[#],
       False], _FrontEnd`CurrentValue
     ] &
  ]

{
"Active","AddOnHelpPath","AllowDataUpdates",
"AllowDebugging","AllowDocumentationUpdates","AllowDownloads",
"AllowExternalChannelFunctions","AllowGroupClose","AllowInlineCells",
"AllowReverseGroupClose","AnimationCycleOffset","AnimationCycleRepetitions",
"AnimationDisplayTime","AnimationRunning","Antialiasing",
"AspectRatioFixed","AutoGeneratedPackage","AutoIndent",
"AutoItalicWords","AutoloadPath","AutomaticWolframCloudLogin",
"AutoMultiplicationSymbol","AutoNumberFormatting","AutoOpenNotebooks",
"AutoOpenPaclets","AutoOpenPalettes","AutoQuoteCharacters",
"AutoSpacing","AutoStyleWords","Background",
"BackgroundAppearance","BackgroundAppearanceOptions","BlinkingCellInsertionPoint",
"BoxFormattingRecursionLimit","BoxFormFormatTypes","CacheGraphics",
"CaseSensitiveCommandCompletion","CellAutoOverwrite","CellBaseline",
"CellChangeTimeMergeInterval","CellChangeTimes","CellContext",
"CellDingbat","CellDynamicExpression","CellEditDuplicate",
"CellEditDuplicateMakesCopy","CellEpilog","CellEvaluationDuplicate",
"CellEvaluationFunction","CellEventActions","CellFrame",
"CellFrameColor","CellFrameLabelMargins","CellFrameLabels",
"CellFrameMargins","CellFrameStyle","CellGrouping",
"CellGroupingRules","CellHorizontalScrolling","CellInsertionPointCell",
"CellInsertionPointColor","CellLabel","CellLabelAutoDelete",
"CellLabelMargins","CellLabelPositioning","CellLabelStyle",
"CellMargins","CellOpen","CellProlog",
"CellSize","CellSplitCopiesTags","CellTags",
"CharacterEncodingsPath","ClearEvaluationQueueOnKernelQuit","Clickable",
"ClipPlanes","ClipPlanesStyle","CloseOnClickOutside",
"ClosingAutoSave","ClosingSaveDialog","ComponentwiseContextMenu",
"ConfigurationPath","ContextMenu","ControlsRendering",
"ConversionRules","ConvertersPath","Copyable",
"CounterAssignments","CounterIncrements","CounterStyleMenuListing",
"CreateCellID","DataCompression","Default2DTool",
"Default3DTool","DefaultAttachedCellStyle","DefaultControlPlacement",
"DefaultDockedCellStyle","DefaultDuplicateCellStyle","DefaultFontProperties",
"DefaultFormatType","DefaultInlineFormatType","DefaultNaturalLanguage",
"DefaultNewCellStyle","DefaultNewGraphics","DefaultNewGraphics3D",
"DefaultNewInlineCellStyle","DefaultNewInlineGraphics","DefaultNewInlineGraphics3D",
"DefaultNotebook","DefaultPackageStyleDefinitions","DefaultReturnCreatedCellStyle",
"DefaultScriptStyleDefinitions","DefaultStyleDefinitions","Deletable",
"DelimiterFlashTime","DelimiterMatching","Deployed",
"Dictionaries","DigitBlock","DigitBlockMinimum",
"DockedCells","DragAndDrop","DynamicEvaluationTimeout",
"DynamicUpdating","Editable","EmphasizeSyntaxErrors",
"Enabled","Evaluatable","EvaluationCompletionAction",
"EvaluationMode","EvaluationQueueActions","Evaluator",
"EvaluatorNames","EvaluatorStartup","ExportAutoReplacements",
"ExternalDataCharacterEncoding","FileChangeProtection","FillForm",
"FontColor","FontFamily","FontOpacity",
"FontSize","FontSlant","FontSubstitutions",
"FontTracking","FontWeight","FormatType",
"FormatTypeAutoConvert","FrontEndDynamicExpression","FrontEndEventActions",
"FrontEndStackSize","GeneratedCell","GenerateImageCachesOnPlacement",
"GeometricTransformation3DBoxOptions","GeometricTransformationBoxOptions","GlobalInitializationCellWarning",
"GreekStyle","GroupOpenerColor","GroupOpenerInsideFrame",
"GroupPageBreakWithin","HomePage","Hyphenation",
"IgnoreSpellCheck","ImageMargins","ImageRegion",
"ImageSize","ImageSizeMultipliers","ImportAutoReplacements",
"IncludeFileExtension","InitializationCell","InitializationCellEvaluation",
"InitializationCellWarning","InitializationGroup","InputAliases",
"InputAutoReplacements","Language","LanguageCategory",
"LegacyGraphicsCompatibility","Lighting","LimitsPositioningTokens",
"LinebreakAdjustments","LinebreakSemicolonWeighting","LineBreakWithin",
"LineIndent","LineIndentMaxFraction","LineSpacing",
"LowerCaseStyle","Magnification","MaintainDynamicCaches",
"MarkerAspectRatio","MarkerLineThickness","MenuCommandKey",
"MenuSortingValue","MessageOptions","MousePointerAppearance",
"MultilaunchWarning","MultiLetterItalics","MultiLetterStyle",
"NotebookAutoSave","NotebookBrowseDirectory","NotebookDynamicExpression",
"NotebookEvaluateRecursionLimit","NotebookEventActions","NotebookPath",
"NotebooksMenu","NotebooksMenuHistoryLength","NumberMarks",
"NumberMultiplier","NumberPoint","NumberSeparator",
"OutputAutoOverwrite","OutputSizeLimit","PageBreakAbove",
"PageBreakBelow","PageBreakWithin","PageFooterLines",
"PageFooters","PageHeaderLines","PageHeaders",
"PageWidth","PalettePath","PalettesMenuSettings",
"ParagraphIndent","ParagraphSpacing","PasteAutoQuoteCharacters",
"PasteBoxFormInlineCells","Placeholder","PreferencesPath",
"PreserveOldOutputGraphicsAttributes","PrintAction","PrintingCopies",
"PrintingPageRange","PrintingStartingPageNumber","PrintingStyleEnvironment",
"PrintPrecision","PrivateEvaluationOptions","RasterExploreViewRange",
"ReferenceSystemApplication","ReturnCreatesNewCell","RulerUnits",
"Saveable","ScreenInformation","ScreenRectangle",
"ScreenStyleEnvironment","ScriptBaselineShifts","ScriptLevel",
"ScriptMinSize","ScriptSizeMultipliers","ScrollPosition",
"Selectable","ShowAutoConvert","ShowAutoSpellCheck",
"ShowAutoStyles","ShowCellBracket","ShowCellLabel",
"ShowCellTags","ShowClosedCellArea","ShowCodeAssist",
"ShowContents","ShowCursorTracker","ShowDiscretionaryLineSeparators",
"ShowGroupOpener","ShowInvisibleCharacters","ShowMissingStyles",
"ShowPageBreaks","ShowPredictiveInterface","ShowSelection",
"ShowShortBoxForm","ShowSpecialCharacters","ShowStringCharacters",
"ShowSyntaxStyles","SingleLetterItalics","SingleLetterStyle",
"SpanAdjustments","SpanCharacterRounding","SpanLineThickness",
"SpanMaxSize","SpanMinSize","SpanSymmetric",
"SpeechNavigation","SpeedOfTime","SpellingDictionariesPath",
"StripOnInput","StripStyleOnPaste","StructuredSelection",
"StyleBoxAutoDelete","StyleBoxOptions","StyleEnvironment",
"StyleHints","StyleKeyMapping","StyleMenuListing",
"StyleSheetPath","SystemConsoleApplication","SystemHelpPath",
"TabFilling","TabSpacings","TaggingRules",
"TemporaryControlActiveInterval","TextAlignment","TextClipboardType",
"TextJustification","TrackCellChangeTimes","TraditionalFunctionNotation",
"TransitionDirection","TransitionDuration","TransitionEffect",
"VariableChangesAreEdits","VersionedOptions","VersionedPreferences",
"VirtualGroupData","Visible","WebNotebooksDirectory",
"WholeCellGroupOpener","WindowClickSelect","WindowElements",
"WindowFloating","WindowFrame","WindowFrameElements",
"WindowMargins","WindowMovable","WindowOpacity",
"WindowPersistentStyles","WindowSize","WindowStatusArea",
"WindowTitle","WindowToolbars","WolframCloudBaseUrl",
"WolframId","ZeroWidthTimes"
}