@verb #9359:"message_id" this none this rxdo #8084
@program #9359:"message_id" this none this
caller == this || raise(E_PERM)
{id, ?ng = #-1} = args
if (i = listiassoc(id, this.message_ids))
  return i
else
  this.message_ids = {@this.message_ids, {id, ng}}
  ng = this:get_newsgroup_for_id(id)
  return {id, ng} in this.message_ids
endif
"Last modified by Lao-Tzu (#8084) on Tue Jan  8 08:06:13 2002 MST."
.