Programs designed to monitor user activity. They may be used with or without consent. Because it is sold commercially, many anti-virus vendors do not detect them. The most common form of a commercial monitoring tool comes in the form of a keystroke logger, which intercepts keystrokes from the keyboard and records them in a log. This can then be sent to whoever installed the software, or keylogger, onto the machine. Some Commercial Monitoring Software may take screenshots or video and send the information to an outbound connection.
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From their website:
"Silent Logger combines several powerful surveillance tools in order to give you the most in depth analysis of the people who use your computer. With Silent Logger you will be able to do everything from quickly finding out email passwords and sign in details to monitoring all visited websites. Additionally Silent Logger will provide you with detailed logs of information such as BOTH sides of AIM, AOL, Yahoo, ICQ, and MSN chat conversations. The extensive monitoring capabilities of this software will enable you to find out exactly what people do on your computer.
One of the most unique features of Silent Logger is that it has the ability to automatically and discreetly send you the "spy logs" to whatever email address and time interval you set."