[MSDN Library June 1998] Optional Features of ACM Drivers (22.8999746892892%)

MSDN Library Visual Studio 6.0 > DDK Documentation > Windows 95 Device Driver Kit > Design and Implementation Guide > Audio Compression Manager Drivers > About the Audio Compression Manager

[MSDN Library June 1998] Optional Printer Interface Driver Functions (21.6708669354839%)

MSDN Library Visual Studio 6.0 > DDK Documentation > Microsoft Windows NT 4.0 DDK > Graphics Drivers > Design Guide > Part 3: Print Components > Chapter 10 Supporting DDI Printing and User Interface Functions > Supporting Printer Interface Driver Functions

[MSDN Library June 1998] Optional Sessions (21.0865495391705%)

MSDN Library Visual Studio 6.0 > Conference Papers > PDC 96 Conference Papers > Exploiting Distributed Services > Day 4 (Thursday, November 7)

[MSDN Library June 1998] Optional Report Message Properties (20.9173387096774%)

MSDN Library Visual Studio 6.0 > Platform SDK > Database and Messaging Services > Messaging API (MAPI) > Guide > MAPI Programming Basics > Messages > About Message Properties

[MSDN Library June 1998] Optional Graphics Driver Functions (20.8877919911012%)

MSDN Library Visual Studio 6.0 > DDK Documentation > Microsoft Windows NT 4.0 DDK > Graphics Drivers > Design Guide > Part 1: Graphics Drivers > Chapter 3 Supporting the DDI > Graphics Driver Function Support