Is it possible to have two browser windows opened simultaneously with different sessions?

Question

Is it possible to have two browser (IE and FF mainly) windows opened simultaneously with different HTTP sessions for the same web application? I think I remember that this actually was the standard way back then in IE 6.

Answer 1

In IE8 and above, you could open multiple instances of this browser by running it with the -nomerge parameter. This way, session cookies will be separate for each instance. (source: IEBlog)

For Firefox, there are several ways to achieve the same result, as listed here on SuperUser

Chrome/Chromium and Opera have Private Mode, in which session cookies aren't shared with other windows of the same browser (create a Private window with Ctrl+Shift+N)

Tested in all of the above; note that this is universally valid only for session cookies (those which expire when you close the browser) - persistent cookies are handled slightly differently in each browser.