sdsResource
DefVideoRec structure
#include <Start.h>
typedef structure { Size Offset Description
char sdSlot; 1 0 Slot number
char sdSResource; 1 1 SResource ID
typedef DefVideoRec *DefVideoPtr;

Notes: This structure is used in calls to GetVideoDefault and SetVideoDefault
to alert the system to the existence of a default video (or its lack), what
kind it is and where it can be found.