Argos Monitoring is a program designed to track all activity on your computer, so you can see exactly what everyone using the machine is doing. The program operates in complete stealth mode, and there's no way to access the control panel without the master password.
Pros

Totally hidden: This program operates completely hidden from anyone who doesn't know it's there. There is no record of it in any index another user could access, and the only way the control panel shows up is if you type in your master password and press "Enter." You can do this on any screen at any time.
Nice interface: When you do access the control panel, you'll find its navigation smooth and its controls intuitive. There are options to view a recording of the previous day's activity at any speed you like, and you can move to different days by clicking them in a calendar. You can also do a direct search for particular keystrokes.
Cons

Don't forget: If you forget your master password, there is no way to recover it. You will not be able to access any of the existing logs. The only way to change your password is from the control panel, itself.
Bottom Line

Argos Monitoring is an excellent choice if you want to keep tabs on what other users are doing on your computer with or without them knowing about it. You can try it out free for seven days, and then you'll have to purchase a license for $39.95 to keep using it.
Editors' note: This is a review of the trial version of Argos Monitoring 1.65
Argos Monitoring - Monitor and record your PC activity - Download Video Previews:

Publisher's Description

From Argosafe:
Argos Monitoring provides an advanced monitoring solution for recording user activity on a PC. It is specifically designed for stealth, ease of use, as well as intuitive and efficient playback. Argos Monitoring invisibly and securely logs computer activity, and provides an advanced viewer for playback and filtering of the recorded data.
Argos Monitoring provides the following key features: State-of-the-art secure efficient and invisible monitoring, keyboard logging, visited websites logging, screen captures, user friendly control panel, advanced recorded data playback, search and filtering of recorded data, and easy configuration and setup.
Argos Monitoring provides a state-of-the-art invisible monitoring solution. The program is completely invisible (does not show in Task Manager, no shortcuts or program folders, etc), and the only way to access it using the password you have set. This is in contrast to the majority of other monitoring solutions available, which have a poor level of invisibility, and their presence can be easily detected.
The main goal we had in mind when developing this software was providing a user friendly intuitive user experience. We spent major efforts in hiding the immense complexity of the program under the hood, so that the configuration of the program is done by merely a few mouse clicks. Argos Monitoring's ease of use, in addition to its advanced features, makes it an ideal solution for parental monitoring.
What's new in this version: Version 1.65 is a bug fixing release.