F = E + universal marshaller & self register

**** .idl ****

interface IXxxx : IUnknown

library XxxxLibrary
    coclass CoXxxx

**** .h ****

class CoXxxx : ITest
// IUnknown methods
// IXxxx methods

class CoXxxxFactory : IClassFactory
// IUnknown methods
// IClassFactory methods

**** registry ****

name -> co class GUID
co class GUID -> name
co class GUID -> DLL
co class GUID -> library GUID

auto via DllRegisterServer and DllUnegisterServer in DLL

**** C++ usage ****

import tlb

IXxxxPtr p
IXxxxPtr.CreateInstance()

or:

IXxxxPtr p()

**** C# usage ****

CoXxxx co = new CoXxxxClass()
IXxxx o = (IXxxx)co