Here are some pics of the VPN client I use on my desktop to connect to the wireless. The first two pics show my settings, and the third pic shows the box that comes up when I hit connect (notice the need for two different user names... PennState and then my student ID). I dont quite know what youre asking but maybe these answer your question?
*note - the third pic shows the same box that comes up for the wireless network but its for a different network. Im not on campus right now so I just used that to show you an identical box to show what i meant by multiple log ons.