Note This function has been superseded. Use SendInput instead.
Absolute data is specified as the mouse's actual x-coordinate; relative data is specified as the number of mickeys moved. A mickey is the amount that a mouse has to move for it to report that it has moved.
Relative mouse motion is subject to the settings for mouse speed and acceleration level. An end user sets these values using the Mouse application in Control Panel. An application obtains and sets these values with the SystemParametersInfo function.