how do you get internet on two pc's w/ one modum..??

[chevy44]

okay boys and girls... i just purchased a pc for my room, we already have a pc in the family room w/ cable high speed internet. now i was told to buy a wireless router so that both would have internet access. but i was also told that i need to purchase a wireless card (?? wtf is taht) so can someone help me out, im not exactly computer savvey.. and if there is another alternative that would be helpful too cuz the wireless card is about $70 (i heard) ....thanx for the help

[Elysium]

wrong section