Acer 5520 - Manual (Page 45)

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Three productivity keys give users one-touch access to protection and
manageability features for a more secure, smarter and easier way to work.
•
Lock key - runs the Windows® lock function to lock the notebook
when you step out. If the laptop is equipped with Acer Bio-
Protection, you only need to swipe your finger to log into
Windows® again.
• Presentation key - minimizes open application windows and
prepares the display for impressive presentations.
•
Sync key - instantly synchronizes your computer system to an
external storage device, for convenient and secure backup.
Icon Productivity key Default application
Lock Launch Windows Lock function
Presentation Minimizes your open windows and
prepares your display for presenting
Sync Launch NTI Shadow