We use the sinstance evrsion here at work. With a mod to the MMF structure such that if another instance starts up, it can copy the command line across into the object, send a registered message across to the other instance to tell it to open it and then kill itself. Works very well, just need to be careful about access to the MMF object. Need to avoid those race conditions, as you can open multiple docs at once in explorer. Roger Allen Sonork 100.10016 Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003