Hi,
Search for Mutex is the download section, there are a few samples there.

>Dear all
>
>I want to add a function in main prg file of a project that if user is clicking on icon of my exe file, function should check that exe file is allready running or not. If Exe file is allready Running function should give message to user that "Program is allready Running "
>
>please guide me to make above function.
>
>Rajesh