Lenovo ThinkPad T420 (English) User Guide - Page 184
Security feature, If you use the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3
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2. Press the eject button (1) until the computer moves up; then, grasping both sides, remove the computer (2). Security feature The ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) has a security keyhole for a mechanical lock. By attaching a mechanical lock with cable there, you can secure the ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) to a heavy object, such as a desk. If you use the ThinkPad Port Replicator Series 3, and attach a mechanical lock, the eject button is also locked, so that the computer cannot be detached from the ThinkPad Port Replicator Series 3. If you use the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W), and attach a mechanical lock, the eject button is not locked. To lock the eject button, use the "system lock key" on page 156. Lenovo does not offer a mechanical lock. You will need to purchase one elsewhere. You are responsible for evaluating, selecting, and implementing any locking device and security feature. Lenovo makes no comments, judgments, or warranties about the function, quality, or performance of any locking device or security features. 166 User Guide