NEC Server 140Rc-4 - Manual (Page 245)

Troubleshooting 8-7
UID Lamp
Pressing the UID switch turns the UID lamp located on the front and rear of the server on and off.
The UID lamp is visible through the rear of the chassis and allows you to locate the server you're
working on from the rear of the servers on a rack.
Access Lamps
The access lamps for the floppy disk drive and the CD-ROM drive light when access is made to a
media in the drive.
UID switch
UID lamp
UID lamp