TApplication.ExtendedKeysSupport property
Controls whether extended key codes are available in key down and key up messages.
Declaration
property ExtendedKeysSupport: Boolean read FExtendedKeysSupport write FExtendedKeysSupport;Description
When enabled, ExtendedKeysSupport causes Shift, Ctrl, and Alt (Menu) (Options or Mac OS) to generate distinct values for the left and right keys. The values can then be handled in OnKeyDown and OnKeyUp event handlers, or in overridden KeyDown and KeyUp methods.
See VK_LSHIFT in LCLType for more details.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.