integer poweron = 0;

power_on() {
    // nothing
}

power_off() {
    // nothing
}

default
{
    touch_start(integer total_number)
    {

        poweron = !poweron;
        llMessageLinked(LINK_SET, poweron, "power", NULL_KEY);

    }

    link_message(integer sender_num, integer num, string str, key id)
    {

        if(str == "power")
        {

            if(num == 0)
                power_on();
            else
                power_off();

        } else {
            llOwnerSay("unknown message type: " + str);
        }

    }
}