Lenovo ThinkPad T520i (English) User Guide - Page 210
Using the system lock key, Mini Dock Plus Series 3
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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. 192 User Guide
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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.
192
User Guide