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Secunia PSI 3.0 is a free computer security solution that identifies vulnerabilities in non-Microsoft (third-party) programs which can expose PCs to attacks. Simply put, it is scanning software which identifies programs in need of security updates to safeguard the data on your PC against cybercriminals.
The Secunia CSI Agent is a small, simple, customizable, and extremely powerful CSI scan engine, that offers a fully featured command line interface (CLI) to the CSI scanning functionality. This allows you to run CSI scans directly on the command line or to embed the Agent in a customized script.