And Sony's version of Android allows multiple windows too though they're floating windows that you can drag about the screen over a full screen app rather than split-screen. They have to be specially written as 'Small apps' though.

Typically you'd use them for post-its, calculators etc. Semi-handy on a tablet, not so much on a phone.

http://developer.sonymobile.com/2012...eria-tablet-s/