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It isn't easy to monitor our kids' computer use every time they log on to the internet. Moderating what they are allowed to see online is key in these situations. My own family uses Content Watch. The company recently acquired Net Nanny and is constantly working to improve their service. We have tried a few applications over the past couple of years, but for us, this one has been the best, the easiest to navigate, and the most reliable.
I really like the control I have over how much or how little my kids can access online and all of the controls are accessible to me from any computer. I am even able to stipulate the times they are able to use the internet if excessive computer use is becoming an issue.
Although I don't choose to log what they are typing, nor do I read their emails, some parents will prefer this option, and have access to this feature with the Content Watch program. It is very inclusive in terms of the features that are available and can be customized to suit all parents with kids of any age.