LockedList

    ${Do}
        LockedList::FindProcess "${EXECUTABLE}" # must be in "" because of Spaces!
        Pop $R0 ; PID
        ${If} $R0 != ``
            Pop $R0 ; EXE
            Pop $R0 ; Windows Title
            MessageBox MB_RetryCancel|MB_TopMost $(CLOSE_SF) IdRetry again
                Abort
            again:
        ${EndIf}
    ${LoopWhile} $R0 != ``