Possible Clues:

• Entry requirement, often
• Desperate measure to introduce new form of ID
• Identifier used as login
• Different menus are what’s needed for computer access?
• Online identity in America, Spain, Niger and Albania leading to yours truly?
• @ follower, on Twitter
• Employer to handle online identity
• Handle needed for laptop?
• Online ID? Menus are reviewed
• Code by which one is identified when gaining access to a computer network