void main()
{
    object oPlayer = GetLastUsedBy();
    object oChair;

    if (GetIsPC(oPlayer))
    {
        oChair = GetNearestObjectByTag("Chair", oPlayer, 0);
        if (GetIsObjectValid(oChair) && !GetIsObjectValid(GetSittingCreature(oChair)))
        {
            AssignCommand (oPlayer, ActionSit (oChair));
        }
    }
}