Yes. But the bad news is that I don't remember how. I had a setup way back with two lines, one up and one down, but can't for the life of me remember how I did it (Haven't connected with a modem since the last millenium...)
yes, its called shotguning. its not done much any more. your isp has to support it and you probly need two accounts to do it. as far as setup on the computer, i think its built into windows 2000, just one extra setting. but ive never done it before so im not sure.