How can you find out if another VI running on the same computer and how can you find out the name of that VI?

Suppose that several VIs running simultaneously on the same computer. How can I find out the names of the running VIs, from another VI?

If the already running VIs are clones of the same basic VI, open and run with the option "Prepare to call and forget", how can I find out the names and index of each clone?