[MSDN Library June 1998] Optional Second Element (Only Used by X.25 SVC) (36.9076210127524%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Microsoft SNA Server > SNA Device Interface Specification > Reference > Message Formats > Open(LINK)

[MSDN Library June 1998] Optional Methods (34.1053921568627%)

MSDN Library Visual Studio 6.0 > Platform SDK > COM and ActiveX Object Services > COM > Appendixes > ActiveX Control and Control Container Guidelines > Containers

[MSDN Library June 1998] Optional Sessions (31.1390434552199%)

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 Tag Values (28.9634586149117%)

MSDN Library Visual Studio 6.0 > DDK Documentation > Windows 95 Device Driver Kit > Design and Implementation Guide > Image Color Matching and Printer Drivers in Windows 95 > Overview of ICC 3.0 Profile Tags Used by Windows 95

[MSDN Library June 1998] optional (27.9814520402756%)

MSDN Library Visual Studio 6.0 > Platform SDK > COM and ActiveX Object Services > Automation > Type Libraries and the Object Description Language > ODL Reference > Attribute Descriptions