MInterfacePointer is an NDR-marshaled structure that MUST contain a hand-marshaled OBJREF.

 typedef struct tagMInterfacePointer {
   unsigned long ulCntData;
   [size_is(ulCntData)] byte abData[];
 } MInterfacePointer;

ulCntData: This MUST specify the size, in bytes, of the abData parameter.

abData: An array of bytes that MUST contain an OBJREF.