gasket3m.c - Version of gasket3.c with mouse interaction to stop redrawing.
gasket3md.c - Double buffered version of gasket3m.c
These allow demonstartion of effects of application redraw on various window
actions such as occluding by another window, moving etc.
tetra.c - Three-dimensional tetrahedral version of gasket2.c.
tetrapf.c - tetra.c with a menu to choose the number of subdivisions.