XPLMUnregisterDataAccessor

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XPLM_API void       XPLMUnregisterDataAccessor(
                         XPLMDataRef          inDataRef);

Use this routine to unregister any data accessors you may have registered. You unregister a dataref by the XPLMDataRef you get back from registration. Once you unregister a dataref, your function pointer will not be called anymore.