Locking windows and other keys

I am wondering if there is a better way to do this. I want an application when it runs to inhibit the use of ctl+esc, alt+tab, windows+any, and any other key presses that cause the user to lose focus to the application. I did this many years ago on a Windows 95 by telling the OS that the application was a screensaver using SystemParametersInfo() SPI_SETSCREENSAVERRUNNING. How can I do this for a C# app running on XP?
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you will have to implement a windows hook for this.
take a look here: http://www.codeproject.com/csharp/NetWin32Hooks.asp

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