Lenovo ThinkPad T420si (English) User Guide - Page 164
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. 148 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.
148
User Guide