[MSDN Library April 2000] Optional Methods (80%)

MSDN Library - April 2000 > Platform SDK > Component Services > COM > Controls and Property Pages > Guide > ActiveX Control and Control Container Guidelines > Containers

[MSDN Library April 2000] Optional Methods in Control Interfaces (53.0263157894737%)

MSDN Library - April 2000 > Platform SDK > Component Services > COM > Controls and Property Pages > Guide > ActiveX Control and Control Container Guidelines > Controls

[MSDN Library April 2000] Optional Message (50.3125%)

MSDN Library - April 2000 > Windows Resource Kits > Windows 2000 Server Resource Kit > TCP/IP Core Networking Guide > Appendixes > DHCP Options > DHCP Extensions

[MSDN Library April 2000] Optional Fields (34.1053921568627%)

MSDN Library - April 2000 > Platform SDK > Web Services > Internet Information Services SDK > Programmer's Guide > Reference > Internet Database Connector Reference > Internet Database Connector Fields

[MSDN Library April 2000] Optional Virtual Keys (27.8317577030812%)

MSDN Library - April 2000 > DDK Documentation > Windows 95 DDK > Windows 95 Documentation > Design Guide > Windows 95 Keyboard Driver > Virtual-Key Codes