targeting.MKI

float scanrange=20;
list tgtkeys;

GOTCHASUCKER(key target){
    // [endless possibilities]
    llOwnerSay((string)target);
}

default{
    state_entry(){
        llListen(19,"",llGetOwner(),"");
    }
    touch_start(integer total_number){
        tgtkeys=[];
        llSensor("","",AGENT,scanrange,PI);
    }
    sensor(integer num){
        integer i;
        for(i=0;i<num;i++){
            llOwnerSay((string)(i+1)+"-"+llDetectedName(i));
            tgtkeys += llDetectedKey(i);
        }
    }
    listen(integer chan,string who,key id,string msg){
        key target;
        integer tgtindex = (integer)msg;
        integer listsize = llGetListLength(tgtkeys);
        if(tgtindex>0 && tgtindex<=listsize){
            target = llList2Key(tgtkeys,tgtindex-1);
            GOTCHASUCKER(target);
        }
        else
            llOwnerSay("not a valid index");
    }
}