How to avoid giving offense to a user

[Bobb Menk]

We have increasingly encountered something like this scenario:

Patron uses public station to surf web.
Patron visits offensive site
Patron pops up 2nd (or 3rd or 4th or 5th) Netscape window to cover up 
offensive window when others go by station
Patron finishes session leaving Netscape at library home page rather 
than closing Netscape out altogether.
Next patron sits down to discover multiple offensive open Netscape 
windows that had been hidden behind an inoffensive window, gets 
angry etc.

Anyone have suggestions as to how to easily clear all those 
multiple sessions between users?

This is _not_ intended to re-open one of those "filter or not to 
filter" bruhahas.  I'm just interested in suggestions to force  
closing out all instances of a browser or otherwise deal with this 
problem.

Current platform for the public is Win 3.11,  Netscape Navigator 4.
If this is doable in the Win95 version, the upgrade is on the horizon

Thanks in advance for any help.

Bobb Menk, Internet Librarian, Lane Memorial Library
Hampton, NH 03842  603-926-3368
bmenk at hampton.lib.nh.us