Related Clues:

• Computing letters
• MS-__
• Requirements list
• Two, in Cadiz
• Early Microsoft offering
• List on a society calendar
• -- and don'ts
• Subject of the first book 'for Dummies'
• Coiffures, informally
• Two, in Mexico
• Some prom haircuts
• MS ____
• Windows ancestor
• One less than ''tres''
• 27-Across, e.g.