I use ComputerTime application for managing parental controls on my Windows machines. However, I do not know of an equivalent application on the Mac. Is there an application for the Mac that offers parental control like: 1. Specifying when a child can log in to the Mac? 2. What day a child can use the Mac? 3. How much time is allowed per day for use on the Mac and where each session totalled up will not exceed the total allowed time per day? 4. How long each session is allowed? Thanks.