All browsers are considered one Internet session. No matter how many "Windows" or "Browser Pages" (Tabs in IE7) are open, they are all part of that one Internet session. When a user logs in we have controls related to all SDS browser page that change from one page to another. These controls are called Session Variables. Session Variables can be thought of as Page Markers. If two different web pages are started they will get confused. One will set a Session Variables and the other page will see the setting and wonder how it got changed. The use of Session Variables in our system is essential in that it allows for the easy movement of a user from one page to another under strict security. Long story short. One session of SDS on a workstation at a time.