Lenovo ThinkPad T420 (English) User Guide - Page 186
Using the system lock key, Mini Dock Plus Series 3
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Attach a mechanical lock to the ThinkPad Port Replicator Series 3 as follows: Using the system lock key The system lock key has two positions, unlocked and locked. When the key is in the locked position, the eject button of the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) is locked, and you cannot remove your computer. The key lock indicator lights when the eject button is locked. 168 User Guide
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Attach a mechanical lock to the ThinkPad Port Replicator Series 3 as follows:
Using the system lock key
The system lock key has two positions, unlocked and locked.
When the key is in the locked position, the eject button of the ThinkPad Mini Dock Series 3, the ThinkPad
Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) is locked, and you cannot remove
your computer. The key lock indicator lights when the eject button is locked.
168
User Guide