LRESULT DispatchMessage(
  const MSG *lpMsg
);

typedef struct tagMSG {
  HWND   hwnd;
  UINT   message;
  WPARAM wParam;
  LPARAM lParam;
  DWORD  time;
  POINT  pt;
  DWORD  lPrivate;
} MSG, *PMSG, *NPMSG, *LPMSG;

Address   To        From      Size      Comment
0012EFB4  770C5F9F  00631EDE  78        calc.00631EDE
0012F02C  770C4F0E  770C5F9F  5C        user32._GetRealWindowOwner@4+54
0012F088  770C4F7D  770C4F0E  28        user32._DispatchClientMessage@20+4B
0012F0B0  777B702E  770C4F7D  74        user32.___fnDWORD@4+24
0012F124  770CCC70  777B702E  10        ntdll.777B702E
0012F134  00631CAC  770CCC70  D70       user32._DispatchMessageW@4+F
0012FEA4  0064219A  00631CAC  90        calc.00631CAC
0012FF34  7748ED6C  0064219A  C         calc.0064219A
0012FF40  777D37EB  7748ED6C  40        kernel32.7748ED6C
0012FF80  777D37BE  777D37EB  18        ntdll.777D37EB
0012FF98  00000000  777D37BE            ntdll.777D37BE