Check out George Tasker's IsRun32.prg in the files section.

>I am runnning into a problem with some of my less experianced users on slower PCs. They tend to keep clicking on the icon causing my EXE to start more than once. Is there a Windows call or anything that I can use to detect if my exe is already running? I assume there is an api call that returns the currently running processes in windows. The same list you get when you press ctrl/alt/delete.