2.All I know for Amithlon is that it works with the Geforce 2 cards. My Geforce 4 will not work natively.
4.Just shut down the PC by hitting the power switch

I tried to help you the best I can, and can only answer half your questions

Another problem you might run into is the network. Since there are only a batch of cards that work, you probably cant use normal ones you buy at computer stores. I happen to have the one that works perfectly with amithlon, and works swiftly.