thanks for the lesson!!!;) well done!:-D Night Soul!!!

I'm not sure what you found in the article, there are two popular techniques. 1. Use FindNextWindow, looking for a window with the same name as yours. If found then exit. This is the most common method. It fails (or is at least difficult) if the window title is variable or there are many different windows that might or might not be open. 2. Check the list of running processes looking for your .exe name. There should be only one. If two found then exit. Thanks for the help, Bill

Not sure if this will help as it is really old but search MSDN Lib for Q72918 in the title.