Recently active topics in PBwiki tagged with student access to wiki in 20

e-mail address required for 2.0

I have 8 students who dont have their own e-mail accounts. On a topic discussion I saw something about setting up PSEUDO accounts at g-mail but the link to more info. about that topic didn't work. Can you tell me how to do this? I don't want to really issue them e-mail accounts, I just want them to be able to get to our class wiki, write on the pages I have set up for them and comment on other peoples pages.
Thanks for any guidance you can give me around the e-mail address requirement for students on 2.0 PBWiki.

Thanks in advance!