//Let's DM's and creatures possesed by a DM to sit in a DM's chair.
void main()
  {
  object oDM = GetLastUsedBy();
  object oChair = OBJECT_SELF;
  if (GetIsDM(oDM) || GetIsDM(GetMaster(oDM)))
    {
    if (GetIsObjectValid(oChair) && !GetIsObjectValid (GetSittingCreature(oChair)))
      AssignCommand(oDM, ActionSit(oChair));
    }
  else
    SpeakString("Only DM's are allowed to sit here.");
  }