Google+ Hangouts is an application enabled as a part of Clemson Google Apps for Education that provides a method of creating, broadcasting, and/or recording an online meeting or class.
Open a browser and go to http://g.clemson.edu, log in using your Clemson Google Apps for Education login and password. Then click on +You in the upper left hand corner of the black bar. If you have not yet created a Google+ account, create it. Then the +You will change to +YourUserName. You may add friends to circles if you want, and invite those friends to join your Hangout. Click on "Start a Hangout" to begin a meeting.
No. Hangouts is a free application.
No. Hangouts is completely online. You just need to have a web enabled browser to create and share hangouts. You do need a Google+ account, see the link below for how to set that up.