CTRL-NUM LOCK:  Halts the system until a key (or combination of keys) is
pressed.  This is activated by holding down the CTRL key and then pressing the
NUM LOCK key.

On the Tandy 1000:  Press the HOLD key to halt.  Press HOLD again to resume.

On the PCjr:  Hold down FN and press PAUSE to halt.  Press any key to resume.
