XPLMEnumerateFeatures

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XPLM_API void       XPLMEnumerateFeatures(
                         XPLMFeatureEnumerator_f inEnumerator,    
                         void *               inRef);

This routine calls your enumerator callback once for each feature that this running version of X-Plane supports. Use this routine to determine all of the features that X-Plane can support.