This structure is a pointer to a memory stream handler playlist object ACB.
typedef struct _ACB_MEM_PLAYL { ULONG ulACBLen; /* Structure length. */ ULONG ulObjType; /* Object type. */ PVOID pMemoryAddr; /* Memory object starting address. */ } ACB_MEM_PLAYL; typedef ACB _ MEM _ PLAYL * PACB _ MEM _ PLAYL ;