Your program might require to disable Ctrl-Alt-Del key sequence, for example if you don't want your program to be unloaded from memory (it's up to you to decide if your users will love you for that): and it is possible by using the SystemParametersInfo API function. This function is used by Control Panel to customize the Windows environment like setting keyboard-, display-, sound setting parameters and others. Its syntax is as follows:
BOOL SystemParametersInfo(
UINT uiAction, // system parameter to query or set
UINT uiParam, // depends on action to be taken
PVOID pvParam, // depends on action to be taken
UINT fWinIni // user profile update flag
);
The meaning of each parameter is described in Win32 Developer's Reference (kbase.hlp). Now, to do what we want, we must call this function like in the following procedure:
procedure DisableCtrlAltDel;
var
i : integer;
begin
i := 0;
{Disable Ctrl-Alt-Del}
SystemParametersInfo( SPI_SCREENSAVERRUNNING, 1, @i, 0);
end.
Don't forget to place WinProcs unit in "uses" clause of your unit. Remark: To disable the Alt-Tab sequence, you must use the first parameter SPI_SETFASTTASKSWITCH and others are the same as above.