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VXE (Virtual eXecuting Environment) is an Intrusion Prevention System (IPS). It protects Linux servers from hacker attacks from network, etc. It protects software subsystems, such as: SMTP, HTTP and any other subsystem, already installed at the server.
PSeudo terminal Intrusion Detection System.
The kernel part plugs into terminal processing subsystem and logs hashed terminal lines.
The user part reads these, consults a list of allowed entries, and takes appropriate action upon unexpected lines.