
          demand_load procname Attempt to load the specified
          procedure, either as an autoload function or by loading the
          package containing the procedure.  If the package indexes
          have not been loaded for all package libraries in TCLPATH,
          they will be loaded.  Out-of-date library indexes will be
          rebuilt if they are writable.  The procedure returns 1 if
          the procedure was sucessfully loaded, or 0 if it was not.
