[MSDN Library June 1998] IUnknown (63.2352941176471%)

MSDN Library Visual Studio 6.0 > Platform SDK > COM and ActiveX Object Services > COM > Reference > Interfaces

[MSDN Library June 1998] IUnknown (51.7485119047619%)

MSDN Library Visual Studio 6.0 > Platform SDK > Graphics and Multimedia Services > Multimedia Reference > Multimedia Interfaces

[MSDN Library June 1998] IUnknown Interface (49.0522875816993%)

MSDN Library Visual Studio 6.0 > Platform SDK > Graphics and Multimedia Services > DirectX Media SDK > DirectShow SDK > C/C++ Reference > DirectShow COM Interfaces

[MSDN Library June 1998] IUnknown Macro (46.6386554621849%)

MSDN Library Visual Studio 6.0 > Platform SDK > Graphics and Multimedia Services > DirectX Media SDK > DirectShow SDK > C/C++ Reference > Utility Functions

[MSDN Library June 1998] IUnknown (45.4795828437133%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Telephony Application Programming Interface (TAPI) > TAPI Version 3.0 > Call and Media Controls > Call and Media Control Reference > Call and Media Control COM Interfaces