These applications are mostly used in a business environment. They can log network traffic passively, or examine the logs of proxies etc... These programs are not installed on the individual computers. They are designed to run on a central server. They can only log things that pass through the network, not local things like entered passwords, keystrokes or screenshots.
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From their website:
Managing the online employee requires new standards, re-engineered procedures, and intelligent information about employee surfing patterns. FastTracker lets you view employee Internet use and analyze relevant information in real time, while making more efficient use of bandwidth. With the intelligence FastTracker provides, you can turn employee Internet use into an asset, not a liability.
