Easy way to load if not loaded, otherwise run program?

[b15h09]

So, I've got a computer with a 2 terminals attached. Basically, if I've got 3 people on the computer (1 on the host, 2 on the terminals) and they all want to play the same game, each time someone clicks on my mount and play shortcut, it reloads the cd and causes problems for the other users that already have the game started. I want it to work something like this:

When you click a shortcut, it loads the image and starts the program, unless that image is already loaded, then it will just move on to running the program.

Is there an easy way to accomplish this?