Dell PowerEdge C1100 Guide De Mise En Route page 9

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4 Align the four keyhole slots on the chassis rails with the corresponding pins
on the system and slide the chassis rails towards the back of the system
until it locks into place.
5 Align and insert the ends of the chassis rails into the ends of the rails and
push the system inward until the chassis rails lock into place.
Getting Started With Your System
7