Two questions about API calls.

Hi, I am writing a security program. Well if you read my last topic was about a way to encrypt or decrypt files. But I forgot to ask about something else.
I know that there are some API calls which can disable the desktop and the task bar. I have seen them work before I just don't know their name if some one can explain it too I really appreciate otherwise just give me the API calls.

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Kourosh
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Private Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long

put in any event
lockwindowupdate getdesktopwindow()

the lock window update api can onli lock 1 window at a time

Thanks, but can you give me an example I just can't seems to understand it. From the both API's does one of them also luck the Taskbar?