Documentation
- where to get OpenGL for windows
- what exports are suitable (some glut, but not others;  Swapbuffers etc.)
- Instructions for porting from glut applications?

glutVisibility function?

Think about timing of animations

demos/gasket.pl is a good example of where the drawing takes a long time, which
makes resizeing of the windows jerky - look at how to disable drawing while resizing.
