[MSDN Library June 1998] IUnknown (100%)

MSDN Library Visual Studio 6.0 > Visual C++ Documentation > Reference > Microsoft Foundation Class Library and Templates > Active Template Library > Articles > Introduction to COM and ATL > Introduction to COM

[MSDN Library June 1998] IUnknown (36.3799941245593%)

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

[MSDN Library June 1998] IUnknown (35.7721560846561%)

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

[MSDN Library June 1998] IUnknown Functions (32.0614035087719%)

MSDN Library Visual Studio 6.0 > Platform SDK > Database and Messaging Services > Messaging API (MAPI) > Appendixes > Functionality Groups > Function Groups

[MSDN Library June 1998] IUnknown (31.1890838206628%)

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