HI! I am new to this API subject...Basically I need to use windows messages to comunicate with an external application which I control using VB6 and a script file. I need to send messages such as "CONTINUE" or wait for a message from the application saying something like "OK". I am a bit confuse with the message handler for an external application. The message should be sent to a particular window (what is it for an aplication) or should just be broadcasted to all the windows . I take it I need to register the messages i want to receive/send?
And use funtions sendmessage and getmessage ?

Well any help on this I really appreciate.

Thanks

Marco