This is a neat trick I use when developing.
In Windchill it is difficult to 'logout' and then login as another user. To get around this create two browser bookmarks with url format as:
http://username1:password1@windchill-server.ptcnet.ptc.com/Windchill/app/
http://username2:password2@windchill-server.ptcnet.ptc.com/Windchill/app/
This adds the username and password into the http request, so the user is not prompted. This has the added benefit that you can jump user easily in Windchill if you store the url as a bookmark.
This is really useful for demos!
This is an example of one of my bookmarks: