       SippRLEOpen filename [mode]
              Open  the  RLE  file  filename.  Mode is any of the
              standard modes allowed by  the  Tcl  open  command.
              Access  is any of the standard access modes allowed
              by the Tcl open command. If access is omitted, then
              read  access  is  used.   Filename follows the full
              semantics of the file name argument to the Tcl open
              command.   Thus  the  RLE  file  may  be  sent to a
              pipeline,  which  could  be  a  viewer   or   post-
              processing   program.   Thus  to  render  an  image
              directly into the RLE X11  file  viewer  on  a  256
              color display:

                  set rle [SippRLEOpen "|rlequant | getx11" "w"]
