This flag allows applications to receive rawinput messages while in
background. They have to specify a target hwnd, which will receive them,
and the messages will carry a RIM_INPUTSINK wparam if the process wasn't
foreground.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>