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Windows CE 2.12 and later support the CONTRASTCOMMAND escape code, which allows applications to change the display contrast under software control. Applications must pass a ContrastCmdInputParm structure to the ExtEscape function in the lpszInDataparameter. For information on the defined contrast commands and their meanings, see ContrastCmdInputParm .
In Windows CE 2.12, applications were also required to store any contrast settings they applied in the DWORD registry value HKEY_CURRENT_USER\ControlPanel\Keybd\Contrast, so that on warm boot the system would keep the proper contrast setting. Windows CE 3.0 and later have removed this requirement, and applications are no longer allowed to modify that registry value.
Last updated on Tuesday, July 13, 2004