kill ?-pgroup ?signal? idlist

          Send a signal to the each process in the  list  idlist,
          if permitted.  Signal, if present, is the signal number
          or the symbolic name of the signal, see the signal sys-
          tem  call manual page.  The leading ``SIG'' is optional
          when the signal is specified by its symbolic name.  The
          default for signo is 15, SIGTERM.

          If -pgroup is specified, the numbers in idlist are take
          as  process  group ids and the signal is sent to all of
          the process in that process group.  A process group  id
          of 0 specifies the current process group.

          The kill command is not available on Windows 95/NT.

          This command is provided by Extended Tcl.