[MSDN Library June 1998] Optional Implementation (61.3756613756614%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Active Directory Service Interfaces (ADSI) Version 2.0 > Guide > ADSI for Providers > Provider Minimum Requirements

[MSDN Library June 1998] Optional Sessions (27.978061660414%)

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 Arguments (27.896170962138%)

MSDN Library Visual Studio 6.0 > Microsoft Office Development > Office 97 Documentation > Excel > Microsoft Excel 97 Developer's Kit > Writing Great Add-Ins > Why Make an Add-In?

[MSDN Library June 1998] Optional Interfaces for the Visual Designer (27.1916760626506%)

MSDN Library Visual Studio 6.0 > Tools and Technologies > ActiveX Designer Programmer's Reference > Chapter 3: Designing and Implementing an ActiveX Designer > Creating the Visual Designer

[MSDN Library June 1998] Optional Printer Interface Driver Functions (27.0067368032484%)

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