1. A system comprising means for: while booting a computer and prior to allowing a user to logon to the computer, arranging for a markup language rendering engine to be loaded at the beginning of an operating system initialization procedure; and providing markup language code suitable for use with the markup language rendering engine, the markup language being capable of soliciting at least one user input when rendered by the markup language rendering engine, the user input being associated with a user logon process configured to selectively allow a user to logon to the computer.