Hide your application from TaskList

(Ctrl + Alt +Del)

Put this declaration in the implementation of your form :

        Function RegisterServiceProcess ( dwProcessID , dwType : DWord ) : DWord ;

   Stdcall ; External 'KERNEL32.DLL' ;

Now, to hide it:

    RegisterServiceProcess ( GetCurrentProcessID , 1 ) ;

  Show it again:

        RegisterServiceProcess ( GetCurrentProcessID , 0 ) ;