How to use my computer as a wireless access point

Hi, I live in an apartment complex where they only give 1 computer access to their wireless internet, and I live with other people that have computers and they alll have wireless cards for their computer. I want to know how I could use, just my computer, if it is possible, to act as a wireless access point distributing internet to the other computers in my apartment. If this is at all possible, please let me know how I can do this, and if it is not possible with just my computer, then what do I need to get, hardware, to be able to.
Thank you so much,
Mark