Which of the following is NOT a requirement for an application to be "Certified for Windows Program"?
a. Usage of system.settings for size, color, and font
b. Support for Windows "High Contrast" option
c. Usage of sound to notify of critical information
d. keyboard only access to all features including menus, and control.
you can read this.
http://msdn.microsoft.com/en-us/library/aa984454(v=vs.71).aspx