If they're using OS X, there is a Parental Controls system preference. The amount of things that can be set is quite comprehensive: - the apps that can be use

If they're using OS X, there is a Parental Controls system preference. The amount of things that can be set is quite comprehensive: - the apps that can be used - which iTunes/App Stores are available and with what age ratings - whether the camera can be used - whether Mail can be used to contact anyone or just allowed contacts - One of "unrestricted web access", "try to limit access to adult sites" or "allow access only to sites in <list>" - time limits for the account - hours per day, and time of day for weekdays and weekends. - privacy settings - e.g. allow him/her to install an app/use sites, but prevent those apps/sites from accessing things like contacts data etc. The only 'off the shelf' solution that would cover this level of control for macs network-wide, would be to put OS X server onto one of the computers and use network logins, with the appropriate limits set. On Windows a Group Policy probably can achieve the same results, and maybe they're easier to use now, but they were definitely not as point-and-click as Apple's options last time I had any interaction with them.