Have you tried using the VI attached to the last post?
It should use Windows API calls both to control the mouse position and to simulate the click. I don't remember offhand which functions I used there, but you can tell by double clicking the Call Library Function nodes.
You can find more info on this in the Microsoft developer network (MSDN).
Search this site for "DLL Tutorial". There should be a few examples of how to use DLLs in LV.
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