throwing an event into eclipse

could there be any way to "throw" an event from one eclipse "thread"/execution 
to another?
I want to avoid interrupts in order to be portable to windows. I imagine to 
have to eclipse programs A and B where A may want to "signal" B at some point 
(but not using interrupts). I can do this if A is a C++ program that 
initiates B and then A can post an event to B using "post_event()" as the 
documentation says. However, I do not want to use any C++ in my application, 
everything should be ECLIPSE! ;-) I am willing to start B inside A using 
exec/3 or anything similar.

Thanks

Sebastian