@verb #2250:"c_knock" this none this rxdo #7788
@program #2250:"c_knock" this none this
if (this:ok(player))
  who = $su:match_player(args[1])
  who.location:announce(this:_title(), " (", tostr(this), ") knocks on the walls, wondering if it could join. To invite it type: invite " + tostr(this))
  this.knocked = who.location
  this:_notify("You knocked on the walls of " + who.location:title())
  `who.location:knocked(this) ! ANY'
endif
.