       1mpipe 22m?4mfileId_var_r24m 4mfileId_var_w24m?
              Create  a pipe.  If 4mfileId_var_r24m and 4mfileId_var_r24m are specified,
              then 1mpipe 22mwill set the a variable named 4mfileId_var_r24m to  contain
              the  fileId of the side of the pipe that was opened for reading,
              and 4mfileId_var_w24m will contain the fileId of the side of the pipe
              that was opened for writing.

              If  the fileId variables are not specified, then a list contain-
              ing the read and write fileIdw is returned as the result of  the
              command.
