Hi Rob,
We are connecting on a room by room basis with configuration from group policy. The tutors and students are configured to access our gateway server with room keys set for the different rooms so as to only have access to the correct machines. The tutors browse the whole subnet that all school machines are in, and the machines that are not visible are in the same subnet as the others that are.
With regards to support I think our support contract has expired so I doubt we will get anywhere with the support team.
Regards,
JT