HELP WITH MODEM SET UP

[cphoran81]

I am brand new to apple computers and about to make an iMac g5 20" purchase. I have a pretty dumb question but just wanted to ask before I ordered my computer so I could order everything at once. my question is..I already have a windows based pc hooked up to a cable modem in another room of the house and I am planning on hooking up my apple in a different room. I am wondering what equipment I will need to get hooked up (online). Is there anyway I can be hooked up through the existing cable modem running to my other PC wirelessly? I have looked at the apple airport extreme base station but i am not the most computer savy person so i really do not understand what it does. any help would be greatly appreciated. also if it was in lehmans terms that would help out alot. thanks