Onlogic Axial AC101 Product Manual page 13

The second lid locking point is a thumb screw located in the rear of the system.
In the event that the system lid is removed while power is present to the system, the intrusion switch
will detect this event and the Chassis Intrusion sensor will be asserted. Relative to the intrusion, this
event will also be logged in the Baseboard Management Controller event log.
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