Closing other Apps

My password program is called from a macro in a help file. If the user types in the wrong password, then the help file has to be closed. I know that this has can be done with messages, but how?
richweedAsked:
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sleachCommented:
Substitute the  ClassName & caption of the app you want to close into the code below.  If your not sure what they are, use Winsight(included with Delphi).  If you already have the handle to the window, just use it instead of FindWindow.

   PostMessage(FindWindow('ClassName', 'caption'),
   WM_QUIT, 0, 0);

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richweedAuthor Commented:
What about closing all windows?
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