Some Details about Networking and the Client-Server communication
in Unreal.

Especially interesting: the Client prediction,
wich enables the Client to feel Lag-free in term of
immediate inputs such as movement:

http://unreal.epicgames.com/Network.htm

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html