IBM ThinkPad ThinkPad Mini Dock User Manual page 8

ThinkPad Port Replicator II
(1) The power switch turns the computer on and off.
(2) The release button releases the computer from the ThinkPad Port
Replicator II when pressed.
(3) The docking connector is where you attach your ThinkPad computer.
(4) Slide the sliding adjuster forward when attaching the ThinkPad Port
Replicator II to your ThinkPad computer.
ThinkPad Mini Dock
(1) The power switch turns the computer on and off.
(2) The release button releases the computer from the ThinkPad Mini Dock
when pressed.
(3) The security lock key is for locking the release button.
(4) The docking connector is where you attach your ThinkPad computer.
(5) Slide the sliding adjuster forward when attaching the ThinkPad Mini Dock
to your ThinkPad computer.
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ThinkPad Port Replicator, ThinkPad Port Replicator II, and ThinkPad Mini Dock: User's Guide