       keylset listvar key value ?key2 value2 ...?
              Set  the  value  associated  with key, in the keyed
              list contained in the variable listvar,  to  value.
              If  listvar does not exists, it is created.  If key
              is not currently in the list, it will be added.  If
              it  already  exists,  value  replaces  the existing
              value.   Multiple  keywords  and  values   may   be
              specified, if desired.
