Games for networks

Hi,

I'm interested in creating a simple game that can be played on the network here at school.

My questions are...

1) Is this extremely difficult in VB?
2) Is it possible to play a network game with multiple players WITHOUT having anything installed on a server machine? I've been playing this game lately where the player who starts the game acts as the 'host', and I'm wondering how this works.
2) Where could I find sample code or tutorials on how to communicate between computers on the network?

Thanx for any help, or suggestions.

Clint