Join.Me is a super-simple way to share your computer screen with others. It doesn’t require a membership or registration: It's free. There are no plug-ins or spyware, and it’s a really handy tool for work, school or fun.
Just go to Join.Me and click on the ‘share’ arrow. After a speedy program download, a number appears at the top of your screen. Cut and paste it into an email or give it over the phone or Internet to have others -- one or many -- join you on your computer screen. They just enter the number on the Join.Me site and voila! Impromptu collaboration begins!