Asus Transformer 3 Pro T303UA - Manual (Page 38)

38 ASUS Tablet and ASUS Keyboard Dock E-Manual
Drag and drop
Select an item then press and hold the left button. Using your other
finger, slide on the touchpad to drag the item, lift your finger off the
button to drop the item.
Three-finger gestures
Tap
Tap three fingers on the touchpad to invoke Cortana.