Popup-ing and clicking other applications' menus

I managed to retrieve the top-level menu of some programs, firing a timer to check mouse pointer position. I can "click" menu commands from this menu. But I want to popup that menu item, and use it from another Form, let's say (i.e., when clicking on a Label whose Caption is the caption of that top-level menu item, I want to popup that menu to the right of the label). Enough blabber - please help me to popup and use the menus of another application.