hi to all
I'm a c# programmer
i have a 1 question :
how can i send data to controls of other application windows??
for example : how can i send & received message with C# to this windows ???


please help me

Generally the application you're trying to access has to have an API or some method of adding the message in. In this case, I don't think Yahoo messenger does.

Could you maybe go another route, and use the Yahoo Messenger API that is provided by Yahoo, or build a client that interfaces with the service? There may be a library, like libpurple, that you could use.