IBM SelectaDock III, User Manual, Page: 68 / 134

Multiuser Lock
If several users will be sharing the SelectaDock system, use the
multiuser lock. When you use the feature, you also need to
install the cable lock to secure the SelectaDock system itself.
When the multiuser lock is set, the security key is fixed in the Unlock
position and cannot be removed. Thus, the each user who shares
the SelectaDock system does not need his or her own security key.
Each user can dock or undock their computer without a key.
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IBM ThinkPad SelectaDock III User's Guide