       1malarm 4m22mseconds0m
              Instructs  the  system to send a SIGALRM signal in the specified
              number of seconds.  This is a floating point  number,  so  frac-
              tions  of  a  section  may be specified.  If 4mseconds24m is 0.0, any
              previous alarm request is canceled.  Only one alarm  at  a  time
              may be active; the command returns the number of seconds left in
              the previous alarm.  On systems  without  the  1msetitimer  22msystem
              call, 4mseconds24m is rounded up to an integer number of seconds.

              The 1malarm 22mcommand is not available on 1mWindows22m.
