Google’s Aluminium OS Finally Merges Android & ChromeOS

Multi-OS devices are finally becoming viable as Google, Microsoft, and Lenovo rethink how operating systems coexist across modern hardware.
CNET

Tutorial: Permissions, Accounts, and File Organization

Because of its Unix heritage, Mac OS X is a true multi-user operating system from the ground up. Yet some people have used Mac OS X for many months without fully realizing what this means -- as the ...