>If you wish to use both platforms simultaneously, you may use two browsers. Unless the browser used or its configuration supports isolated sessions either with multiple windows or with mulitple tabs, I would recommend that for now.
What I experience in your site feels like a bug. I just now, entered UT. Then closed it, and open the page and try to go to the Chatter. Works. But then, after that, I have no choice to select either UT or Chatter. The choice I get is "Try before creating an account"
UPDATE. If I close the browser completely and then open it again, it works. I will have to remember to close the browser and not just the page/tab
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham