On , there are two different window managers that are commonly used. One of them, called twm; is short for ``Tab Window Manager''. It is larger than the other window manager usually used, fvwm. (fvwm stands for ``F(?) Virtual Window Manager''--the author neglected to tie down exactly what the f stood for.) Both twm and fvwm are highly configurable, which means I can't tell you exactly what keys do what in your particular setup.
To learn about twm's configuration, look at
Section 
. fvwm's configuration is
covered in Section .