[MSDN Library April 2000] Interoperability Using Custom Interfaces (either MIDL or Manually Written Marshalling) (86.6279069767442%)
MSDN Library - April 2000 > Platform SDK > Component Services > COM > COM Fundamentals > Guide > Appendixes > Compatibility with OLE 1 and 16:32-Bit Interoperability > 16:32 Bit Interoperability > Thunk Layer Operation