No, this is not what I need. Jobname(Class) returns me the name of the class you are, not the class that other players are.
And yes I read the script_commands...
I would not have opened a topic if I had found what I asked for.
@edit
I found the logic I wanted, thank you for your attention.
~> http://daemosnet.gotdns.com/files/developers/eAthena-SVN-9162-stable-TXT-W32/npc/custom/eAAC_Scripts/kafraExpress/global_functionsKE.txt
rathena/conf/battle/client.conf
// Visible area size (how many squares away from a player they can see)
area_size: 14
explore your emulator you will learn many things.