Originally Posted by Euklid

Google 'monitoring software'.

Home Keylogger
Actual Keylogger
Web protection

The keylogger ones will appear as a trojan/keylogger in your antivirus software.

Windows Live has a free program called family safety that allows you to block mature
sites. Every time the computer starts, the internet won't work, unless an email/pass
is logged in. If it's a limited account, the person won't be able to view mature or
restricted sites. It also keeps a list of all the websites each user visits.