I need to open two instances of a browser, one as one window as a user in the system with one login and set of session variables, and the other as another user (usually a manager) to manipulate the system through the ZMI. Likewise, sometime is is useful to open two instances of the system so that you can look in one place with one window, and in another place in the other. Most current browsers believe they are the only show in town run multiple instances as separate threads (or so it appear) happily sharing data. This causes problems when, as we do, naviagation information is saved in session variables. The precise behavior depends upon the browser. I guess I am looking for a way to enable the desired behavior by hacking Zope since it's unlikely that I can change the way browsers with an installed base behave. Anyone else encountered this issue or solved the problem.