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 “Double-tap and drag” setting.
If this setting is turned on, you will be able to double-tap on an item using the precision touchpad while keeping your finger down on the second tap, then drag the item.
This tutorial will show you how to turn on or off the double-tap and drag feature of your precision touchpad for your account in Windows 8.1 and Windows RT 8.1.