Community
Activations for standalone products are per computer not per user so you cannot activate two different people's standalone licenses for the same product on the same system simaltaniously
The wording for standalone licneses is this
"A stand-alone license supports one or more Autodesk products for an individual user and computer. "
So multiple users on one computer is a violation of the license agreement. If you are having multiple users access the software is sounds like you want a network license. You can find the full wording at the site linked below.
http://usa.autodesk.com/adsk/servlet/pc/index?siteID=123112&id=18270103