interacting between programs

Ok, here is my question:

I have one program, A which contains a Button, 1.

now i want to beable to use program B to be alerted (or more to detect when) Button 1 is pressed, so that it may copy text out of a text field and display it on the screen.

i looked on msdn and found the GetMessage function, but it said it only worked if the program (B) which was trying to detect the button click was of the same thread as program a.

so is there some way to do what ive described above?

thanks :)

Use the SetWindowsHookEx() function, passing it WH_GETMESSAGE as the hook ID.