The five requirements are
Support standard system settings. This requires your application to be able to conform to system settings for colors, fonts, and other UI elements.
Be compatible with High Contrast mode. This requirement can be met by using only the System palette for UI colors.
Provide documented keyboard access for all UI features. Key points in this requirement are shortcut keys and accessible documentation.
Provide notification of the focus location. This requirement is handled primarily by the .NET Framework.
Convey no information by sound alone. This requirement can be met by providing redundant means of conveying information.