対米全面テロ

同じコンピューターから別々に署名する方法

FAQ: http://www.thepetitionsite.com/petitionfaqs.html
3. How can others in my family sign a petition on the same computer?
We need to ensure that each signature is a different individual. So,
if 2 or more people want to sign the same petition from the same
computer, what you must do is go to http://www.Care2.com (parent
network of ThePetitionSite.com) and create separate individual
accounts for the 2nd, 3rd, ... person. Then log into the Care2 website
using the new account from which you can go to ThePetitionSite.com to
sign the petition.

http://www.Care2.com でユーザー登録をしなければならないようです
それがいやなら，別の署名サイト
http://www.9-11peace.org/
もあります．

日本語解説ページ
http://www.geocities.co.jp/WallStreet/3413/
もご参考に