Related Clues:

• Summon via a P.A. system, e.g.
• Bettie of pin-up fame
• 19-Across has a much-used one
• Knight in training
• Double-slash container
• Address on the Web
• It gets flipped
• Internet address, briefly
• Ellen of 'Juno'
• Web ID
• Congressional aide
• Business card info
• Beeper message
• Folio
• One may be dog-eared