We have NetSupport at school, but many pupils have learned how to stop it working; putting the computer in standby then resuming it (before or during lock) usually stops the lock screen feature working.
Lucid Beta 2 powered Studio 15 (Core 2 Duo 2.0GHz, 3 GB RAM, HD 3450) & Windows XP powered Scaleo E (Celeron D 3.06GHz, 1.5GB RAM, Intel GMA 915G). Please see Ubuntu Tutorials (my YouTube channel).
The bottom line is that the computers are owned by the school district. The school district has the right to restrict its students' use of the computers in any way they like.
I remember working at a public library where we had two sets of computers. We had about eight general purpose computers that people could use for browsing the internet, use a word processor and play games. We also had about four computers that were designated for using the library's online card catalog program only.
Well, for a while, the card catalog computers were not restricted. They were basically just like the general purpose computers, except they didn't have all of the associated games and office software installed. We kept catching people using the card catalog computers to just browse the internet. Eventually, we had to lock down the computers so that the only website they could view was the library's online card catalog. Any attempt to view a different webpage would prompt for a password.
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