integer CHANNEL_ASK     = -120003;
integer CHANNEL_RESPOND = -120004;

string  QUESTION        = "ping";
string  RESPONSE        = "pong";

default
{
    state_entry(){
        llListen(CHANNEL_ASK,    "",NULL_KEY,QUESTION);
        llListen(CHANNEL_RESPOND,"",NULL_KEY,RESPONSE);
    }

    touch_start(integer total_number){
         llRegionSay(CHANNEL_ASK,QUESTION);
    }

    listen(integer channel, string name, key id, string message){
        if(channel == CHANNEL_ASK && llGetAttached())
            llRegionSay(CHANNEL_RESPOND, RESPONSE);

        else if(channel == CHANNEL_RESPOND){
            string owner_name = llKey2Name(llGetOwnerKey(id));
            llOwnerSay(owner_name + " is wearing the item");
        }
    }
}