Custom Cyberpunk Setting - Can someone explain Netrunning?

[fieryscubadivingaccident]

I'm very new to GURPS; I've wanted to run a Snow Crash-inspired cyberpunk game for a while, so I sank some money into Basic Set, Ultratech and Cyberpunk. I'm definitely committed to it at this point. I should have been a little more wary of the versions, because it seems that UT and BS are 4e and Cyberpunk is not.

I'd like to try to implement the Netrunning mechanic in my game, but I just seem to be having a difficult time getting my head around it. I'm not interested in how to port it over to 4e right now as much as I am trying to understand it in the first place.

I seem to be having some difficulty understanding the basic rules for moving from node to node, how combat works in cyberspace, etc. I just can't seem to understand the basics, unfortunately. I'd very greatly appreciate a clear and concise explanation how the core mechanic works if anyone has any knowledge on this subject!