Hamachi simulates LAN over the internet, allowing you to play multiplayer games that can only be played in the LAN, like BG2. It's also useful if you want to play with a group of friends but dont want to muck around with your computer's firewalls.
As for problems, they are mysterious. Me and said friend spent hours and hours trying to get BG2 to work in multipalyer, and when we finally did it worked! But then when we tried to continue our adventure at a later day, bam, mysterious problems. He did have to reformat in between though. So who knows what the problem is, we just got sick of spending hours trying to fix it.
Also, I'd certainly be using my mage, my rather snide but really neutral good mage! He insults moany party members and then gives money to the poor! He also doesnt cast fireball anymore, which is good for everyone in general.
Also-also, nobody can get a bonus from being blind, thats just silly! However higher level monks do get "blind fight" which means even if they are blinded, they can still hit things without missing constantly. At least thats how it worked in NWN2, and I remember that BG2 doesnt have a feat system like NWN2, and "blind fight" is infact a feat.
One more also, as strange as it is, I dont have BG even though I do have BG2.
[ March 31, 2008: Message edited by: Dark ]