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How can disable / enable CTRL-ALT-DEL key combination?
With the help of the Windows API SystemParametersInfo() function it is possible to enable and/or disable the CTRL-ALT-DEL key combination. The SystemParametersInfo function retrieves or sets the value of one of the system-wide parameters.
Function CtrlAltDel( lState )

If !lState
   SysParInfo( 97, 1, 0, 0 )
else
   SysParInfo( 97, 0, 0, 0 )
endif

Return NIL

DLL32 FUNCTION SysParInfo( uAction AS LONG,;
                           uParam AS LONG,;
                           vParam AS LONG,;
                           uWinIni AS LONG ) AS LONG PASCAL;
      FROM "SystemParametersInfoA" LIB "User32.dll"