sentences:  While a mouse is a "relative" pointing device (one uses the mouse to "push the cursor around" on a screen), a tablet is an "absolute" pointing device (one places the stylus where the cursor is to appear).There are a number of human factors to be considered when actually substituting a stylus and tablet for a mouse.For example, it is much harder to target or tap the same exact position twice with a stylus, so "double-tap" operations with a stylus are harder to perform if the system is expecting "double-click" input from a mouse.