funlock fileId ?start? ?length? ?origin?
          Remove a locked from a file that was previously  placed
          with  the flock command.  The arguments are the same as
          for the  flock  command,  see  that  command  for  more
          details.

          The funlock command is not available on Windows 95.  It
          is available on Windows NT.

          This command is provided by Extended Tcl.