The CAUUID structure is a Counted Array of UUID or GUID types. It is used, for example, in the ISpecifyPropertyPages::GetPages method to receive an array of CLSIDs for the property pages that the object wants displayed.
typedef struct tagCAUUID 
{ 
    ULONG     cElems; 
    GUID FAR* pElems; 
} CAUUID; 
 
  Windows NT: Use version 4.0 or later.
  Windows: Use Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in ocidl.h.
ISpecifyPropertyPages::GetPages