[MSDN Library April 2000] Optional Implementation (61.3756613756614%)

MSDN Library - April 2000 > Platform SDK > Networking and Directory Services > Active Directory, ADSI, and Directory Services > Active Directory Service Interfaces (ADSI) > Implementing ADSI Providers > Provider Minimum Requirements

[MSDN Library April 2000] Optional Methods (47.8581021989005%)

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 (42.730074107683%)

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 Tag Values (31.132779198636%)

MSDN Library - April 2000 > DDK Documentation > Windows 95 DDK > Windows 95 Documentation > Design Guide > Printer Driver Overview > Overview of ICC 3.0 Profile Tags Used by Windows 95

[MSDN Library April 2000] Optional Virtual Keys (29.3173124975974%)

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