"Resetting" a network

I'm helping a company out who's IT guy left in a huff. We want to "reset" the network to make sure his passwords and logins are all gone.
What's the easiest way to do this? There are five Macs, each running 10.3.x.
Quicksilver 800   Mac OS X (10.4.8)  

No you didn't say anything wrong, just that no-one around at the moment knows the answer to your query.
I am not sure I do, but to your plaintive cry I offer this.
You do not say whether these machines are connected by ethernet cable to a router or are Airport enabled or something else but I suggest a hard reset of the Router or Airport, done by inserting a pin (unbent paperclip) into the tiny hole for say 10 seconds.
This will reset the router/whatever back to defaults and then your task is to re-establish the network in System Preferences > Network, with the relevant username and password.
This is a little bit vague, but should steer you on the right track.
The other posted comment, while well intentioned is about another issue of resetting passwords on a Mac not about resetting the Network.
regards roam

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