Thanks I got the solution though linking
http://www.codeproject.com/win32/AntonioWinLock.asphas all solution what i was looking for.
>#DEFINE SPI_SETSCREENSAVERRUNNING 97
>Windows Me/98: Used internally; MSDN suggests that applications should not use this flag.
>
>The OS is tricked into "thinking" that the screen saver is running. Works on Win9* systems only.
>
>Microsoft Help an Support
>
How to disable task switching on Win32 platforms>
http://support.microsoft.com/kb/226359/en-us/>
>Foxpro code sample:
>
Using the SystemParametersInfo function>
http://www.news2news.com/vfp/r?example=283>
>IMHO, the better way to run an application with disabled CTRL+ALT+DEL, Windows key and the Task Manager is to start it on a separate Desktop.
>
>Btw, it also disables the Start Menu -- the answer to your another post today.
>
>Foxpro code sample (requires membership)
>
How to prevent users from accessing the Windows Desktop
>and from switching to other applications>
http://www.news2news.com/vfp/?example=492
