[newbie] changing hostname (sorry 'bout this!)

[Heather Reed]

Hi again A quick question this time :-)) When i installed, I panicked at the hostname entry and accidentally entered the hostname of a computer already on the network. I want to change it to something else - where do I go to do that? And do I have to have a domain? All my windoze PCs just have a name - I'm just running a simple peer to peer network. Thanks Heather