Although I am not currently working in a museum I do work in a plave that offers public access to the internet. This is how it works. Persons have to sign in, but do not have to book. Usually we ask them what they are searching for. The majority use it for email - especially the tourists. It provides them an easy and cost effective way to keep in touch with family members back home. We have had no problem with the tampering of programs etc. We do have seperate security on each computer. We log the user on to the computer. If we believe the person was doing something on the computer that they should not, or to see what the interests of the clients are we can do a internet history search. This allows us to see what sites they visted and how long ago, how many times and through the search we can go into the site . As a note: I think that it would be great to have this in a museum since it would provide another reason for people to go and continue to go. Therefore, they will become a custom to seeing all new exhibits, lectures, workshops etc. Good Luck with you project.