DS>Say I am writing a PM app with IBM C Set.
DS>A 3D surface modeler in this case, the app runs fine (the parts that 
DS>are ready) and I push the button to generate a hidden line view from 
DS>a complex 3d model. That takes some time. 

DS>Now this is OS/2 so I want to do something else in the meantime.
DS>Press Ctrl-Esc to get a Window List. No way. After some time OS/2
DS>responds with a message that the app is not responding to system
DS>messages.

I'm probably not the best one to try to answer this as I am a rank
amateur, and I do mean RANK.  However, my guess is that OS/2's single
message queue has bitten you.  You say that you started a time consuming
chore in your program, then it doesn't respond to the keyboard in a
timely manner.  Try starting a separate thread for the time consuming
chore.  This will free up the original thread to process keystrokes.
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