It has no UI or options and consists of a single tray icon.
It is no longer developed, with the latest version released on April 22, 2005.
The system is also capable of blocking custom ranges, depending upon user preferences.
It blocks connections to and from hosts specified in huge block lists (thousands or millions of IP ranges).
They have been criticized for overly broad blocking based on unsubstantiated evidence.
Peer Guardian acknowledges that Battlefield 2, Blizzard, Steam, and Arena Net connectivity is blocked, which creates problems for many online gaming users who are not aware that Peer Guardian will break game connectivity, and are thus directed to read the manual.
Speed and resource inefficiencies were fixed by re-designing and re-coding Version 2.0 in C to consume less processing power and memory.
As with most other desktop firewall software for Windows, Version 2.0 is installed as a kernel-level filter in Windows 2000 and later, giving the application direct access to the Windows networking stack and improving performance.
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The maintainers are members of the Chaos Computer Club (CCC), a long-standing association of hackers and freedom of information activists, and had also briefly run their tracker from the CCC's own network.