This thread is for discussions of Prevent multiple VB application instances.

Put this line in the subroutine where you program starts.

   'If application is already running then get out of here
   If App.PrevInstance = True Then End

hmmm, that is true, the advantage of the method shown here is the fact that FindWindow will give you the hWnd value for the other instance meaning that through subclassing you can send a message to the previous instance - very useful when the user opens a file and there is already an instance running.