RSA SecurID provides two-factor authentication for accessing Microsoft Windows using a username and passcode. It works by hashing the passcode on the RSA ACE/Server and storing the hashed passcodes, emergency access passwords, and encrypted Windows passwords. This allows users to authenticate both online by supplying the username and passcode to the ACE/Server, and offline using cached credentials on the laptop. RSA SecurID for Windows offers a simple, consistent, and secure authentication method with centralized logging and reporting across VPN, wireless, web portals, and applications.