I have set up my mdi app so that only one instance of my app can run at a time. Now the twist is that when the second app is executed and he sees that there is already an instance running, he needs to send to the already running instance a file path/name to open, and then exit. The part where only one instance runs at a time is working flawlessly. The problem that I am having is that I cannot seem to send a user message to the app after calling RegisterWindowMessage(). Is there a good example out there on how to do this correctly? Couple of things trouble me:
1. examples that I have seen show views receiving user-defined messages. Mine is set up for the application to receive. Is this my problem?
2. I do a search in CodeGuru for "RegisterWindowMessage" and get a bunch of hits, but when I do a 'Find on this page' in IE, I get no matches?!

Thanx