[Monkwarrior]

Well let me explain some further.
There is a mod named Battle Grounds, it's all about line-formations (standing in a line and firing).
So I need to find out where everybody is on a regular basis. If I know where they are I can grant them a special status named "Line-formation-mode". It will give them better accuracy etc. etc.

So that's why I want to know where they are and especially who's in their neighbourhood.

Can this be done without too much server-load ?

Monk.