PortableApp Run Only One Instance

PortableAppsMenu should only have one running instance.

I leave the PortableAppsMenu.exe program running (in a hurry, it's just easy to shut the programs and pull rather than click the little icon and hit exit) between use, and when insert my USB key again, i find myself starting up PortableAppMenu again. This creates two instances.

I would like PortableAppMenu to open the current running instance's menu should it be run twice accidentally.