PureBasic Forums - English

I am making a small program atm to keep a check on some computers on a network. My idea is simply to poll each computer every couple of minutes to ensure they are still online & notify me if they fail to answer this poll.
Just wondering how many computers I should be able to scan. { Intention is to send a single character from my server & expect a single character return from each computer }
Has anybody any idea what sort of numbers I should be able to connect to without problems using PB network commands?

At work we have approx. 30.000 clients connected. You should think about a server that registers online users.

Excellent.
Thank you Tranquil. That answers my question totally as the magic number I am looking for would max out at 10,000, but for my purposes I think 256 would be ample.
BTW, what I am up to is trying to make a way of offsite monitoring for normal telephone line integrity & my brainstorm has been to basicly make a little program to effectively ping a computer on each phone number connected through ADSL broadband. ( To help overcome a flaw in low end security systems )