A certified Windows Precision Touchpad is a new class of input devices that provide high precision pointer input and gesture functionality. By default, these devices generate ultra-high precision scroll wheel messages for desktop application consumption.
The August 12th 2014 update rollup from Windows Update for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 introduced a new feature for precision touchpads by adding the “Leave touchpad on when a mouse is connected” setting.
If this setting is turned on, your precision touchpad will stay on when you connect a mouse to the PC.
If this setting is turned off, your precision touchpad will automatically turn off when you connect a mouse to the PC, and will automatically turn back on when the mouse is disconnected.
This tutorial will show you how to turn on or off to leave touchpad on when a mouse is connected for your account in Windows 8.1 and Windows RT 8.1.