Same technique as if you were using paper towels, just use the little plastic bags vs. the paper towel. I have read of other people using wax paper as well.
You like my little signature guy (you'll notice he changes each time the page refreshes)? Heh, he's a fun little bit of coding magic I picked up over at
www.danasoft.com because they did such a nice job and I was too lazy to write my own php code. You can go there and get the skinny about it or get your own... But if you don't feel like following the link here is the deal. The info you see is info you (and everyone) give every web site you visit. The info is the same info I see... Only about myself and I don't see anyone else's info. The data you see is just basically mirror of the data you send to the server, but because forums are "dynamic" web sites and they "give and take" bits of data (cookies) so they know who you are when you are signed in, the coding in my signature merely reflects that info directly back to you. In some ways its really creepy... But that data/info has been given to every web site you have visited since the the beginning of the web, so it's nothing new.