WebPI is an awesome tool designed to keep records of every activity that occurs in your computer while you are absent. It will save all the information that is introduced in any browser, website or text document that has been opened in your machine, such as images and text.
You can protect this application with a password and it will work in the background, hidden away from intruders, employees and children's eyes. They won't ever notice the application is running.
It can be also used to prevent anyone to connect to the Internet by disabling modem access, during a determinate period of time or every time you are not there.