I'm running Parallels Desktop 4.0 for Mac on Mac OSX 10.4.11. For my Mac, I have one administrator account, and two managed user accounts. My son uses one of the managed user accounts to run Parallels. The issue is that I don't want Parallels to be able to access the internet (more specifically, I don't want my son to be able to use Parallels/windows to access the internet). I know I can turn off the internet in Parallels through the Parallels configuration settings, but it can just be turned right back on. There is no password protection to ensure that the settings aren't changed. Or am I missing something? Is there an administrative password that I can enable to prevent tampering with the Parallels configuration settings? Another way to accomplish my goal (no internet for Parallels) would be to turn off all internet access (airport and ethernet) for the Mac managed user account that is used to run Parallels. However, I want to be able to still use the internet on my other two Mac user accounts (one admin and one managed). Does anyone have any insight in how to achieve this? Thanks.