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keyboard input in X

I'm writing a small game for X, using PTC to draw the graphics. The
problem is that I havn't been able to find out how to use the keyboard
for input; PTC's functions is like readkey. I need keyboard functions
that tell me whether a key is down or not.
How do I do this? I guess there are X library functions, but I don't
know where to start.
I would be very grateful if someone could give me a hint on this trivial
matter :)