Microsoft recently demonstrated the new mobile OS, Windows Phone 7, which can play video games from various platforms (Microsoft). This demo is done at Microsoft Tech-Ed at Middle East Conference.
Rudder played computer games in the PC, then move to the Windows Phone 7 to continue the game earlier. After previously using a PC keyboard, then he use touch screen and accelerometer of Windows Phone 7 to play in that device. Then, he move to the Xbox 360 device and continue the game using the usual stick.
Microsoft's future is likely to make an application market for all of Windows operating system, with cross-platform content.