The patent ‘Multi-user mobile telephone’, whose artificer is Tim Ocock, associate ex-Symbian worker, is described as follows:
"A mobile telephone is designed to be used by several different end-users at different times. A first end-user can alter the mobile telephone so that it operates in a manner specific to that first end-user and a subsequent end-user can alter the mobile telephone so that it operates in a manner specific to that subsequent end-user; each end-user has only to respond to prompts displayed on a screen in order to alter the mobile telephone so that it operates in a manner specific to that end-user."
here’s how Google’s marketing material describes the new tablet-only Android feature
"With support for multiple users, you can give each person their own space. Everyone can have their own homescreen, background, widgets, apps and games – even individual high scores and levels! And since Android is built with multitasking at its core, it’s a snap to switch between users – no need to log in and out. Available only on tablets."