XPLMDrawTranslucentDarkBox

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XPLM_API void       XPLMDrawTranslucentDarkBox(
                         int                  inLeft,
                         int                  inTop,
                         int                  inRight,
                         int                  inBottom);

This routine draws a translucent dark box, partially obscuring parts of the screen but making text easy to read. This is the same graphics primitive used by X-Plane to show text files.