Will show if the object owner is Online or Offline in Second Life.

key ownerkey;
string ownername;

default
{
    on_rez(integer start_param)
    {
        llResetScript();
    }
    
    state_entry()
    {
        ownerkey = llGetOwner();
        ownername = llKey2Name(ownerkey);
        llSetTimerEvent(30.0); //check every 30 seconds
        llRequestAgentData(ownerkey, DATA_ONLINE);
    }

    timer()
    {
        llRequestAgentData(ownerkey, DATA_ONLINE);
    }
    
    dataserver(key request, string data)
    {
        if (data == "1")
        {
                
                llSetText(ownername + " is Online", <0,1,0>, 1);
        }
        else
        {
                llSetText(ownername + " is Offline", <1,0,0>, 1);
        }
    }
}