You're overthinking the problem, which is really quite simple.
If you already have a wireless LAN between the two, it's just a matter of setting up some sort of file sharing system. There's the built-in Windows file sharing, which I tend to find quite unreliable and a real PITA to set up... There's also systems like FTP. Little more involved, not necessarily hard, but far more reliable and robust.
You should be able to find plenty of information on either using a search engine, so I won't repeat any of that here.
using my laptop to access my desktop when both are at the same location? They both have wireless connections and there are programs and files each has which are often too large to save to disk or e-mail in order to share. Do I need a program like PC2Go to do this or is there a cable connection I can do which will facilitate this?