Another very configurable thing in X is how to move windows around.
In my personal configuration of twm, there are three different
ways of moving windows around. The most obvious method is to move the
mouse cursor onto the title bartitle bar and drag the
window around the screen. Unfortunately, this may be done with any of
the left, right, or middle buttons
. (To drag, move the cursor above the title bar, and
hold down on the buttons while moving the mouse.)
Another way of moving windows may be holding down a key while dragging
the mouse. For instance, in my configuration, if I hold down
the 
key, move the cursor above a window, I can drag the
window around.
Again, you may be able to understand how the window manager is
configured by trial and error, or by seeing local
documentation. Additionally, if you want to try to interpret the
window manager's configuration file, see
Section 
for twm; or
Section for fvwm;.