Asus TX201LA - Using the operating system (OS) switch key

ASUS Transformer Book Trio E-Manual
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Using the operating system (OS) switch key
When the tablet and the PC station are used individually, they run
using their respective operating systems. But when both devices are
connected and used as an ASUS Transformer Book Trio, you can use
Android® or Windows® 8 interchangeably using the operating system
(OS) switch key.
To guide you through the process of switching between Android® or
Windows® 8, pop-up menus appear whenever you press the switch key
under the following scenarios:
1. Android® is running, Windows®8 is o.
2. Windows® 8 is running, Android®8 is o.
3. Both Android® and Windows® 8 are running
OS switch key