Look at a program called browse control. very cheap and is dummy proof.
Work with her to find a solution to her problem eg imperro software for classroom control.
Find a price for the solution and the whole school training. Then get her to put that to leadership for funding. You've done your bit in providing a solution. Her battle is then elsewhere. Maintain her enthusiasm, support her but redirect her.
Do not go for the manual proxy authentication as if you then need to block a student's internet access through the proxy they will just use their friends' account and you'll not be able to control that, at least we've found no way of doing it.
As a workaround could yuo write a script linked from the teachers desktop that resets the proxies or default gateway on the class PCs to be something that doesn't allow access.
Using PStools "PSExec" command to run netsh
(Configure TCP/IP from the Command Prompt)
or to reset the proxy using something from:
CodeProject: Change Internet Proxy settings. Free source code and programming help
I've not used either just done a simple google search.
Set a cron job on the server to undo the changes at the end of each lesson.
This wouldn't survive a reboot
If you use linux for dhcp you could hard code the IP and DG for PCs in that room in dhcpd.conf and with two copies just copy one in place for her lessons so it would survive a reboot.
Or you could just buy AB Tutor, which gives much better control of that sort of thing, plus lots of other benefits - teachers here love it.

FN whats the issue with tabs in IE7?
We have RRC as well as BrowseControl (cheap and we had it before we got RRC. Staff like RRC as itallows them the control).
Not seen any issue with IE7. There was another post about title checks not working with LAN Ranger and tabs in IE7. Again I've looked at this and it seems to work fine.

We have RRC, if the student has more than one tab open it doesn’t register to the other tabs to the control. Thus causing normal browsing when the restrictions are applied.
We had this problem, disabling tabs just simply fixed it. Defeats the object of IE7 abit though.
You could always tell the teacher that if she doesnt like your IT setup, she could move "down the road" to her friends school![]()
We have a second logon at our school, (not for much longer) the current proxy filter (I inherited it) server, will not talk to NetWare servers no matter what and the company don't care, so I now have permission to buy a new proxy server and the company promises it will intergrate through LDAP perfectly with Netware!
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