Pixels in decimal
Establishes the height of the rectangle that Windows 2000 uses to detect double-clicks. If sequential clicks are positioned within the rectangle defined by the values of the DoubleClickHeight and DoubleClickWidth entries, and if they occur within the time specified by the value of the DoubleClickSpeed entry, then they are interpreted as double-clicks. Otherwise, they are interpreted as sequential single clicks.
To view and change the value of this entry, applications must use the SystemParametersInfo API.