computer building - What is Chassis ID LED on motherboard?

I'm a little confused about the purpose of the ID LED (Chassis ID LED, page 99 in the manual for the S5520UR motherboard). The manual states this about the ID LED:

The chassis ID LED provides a visual indication of a system being serviced. The state of the chassis ID LED is affected by the following:

Toggled by the chassis ID button

Controlled by the Chassis Identify command (IPMI)

Controlled by the Chassis Identify LED command (OEM)

And that a 1Hz blink for the ID LED means that the state of the system is "Identify active via command." I don't understand what this means and I haven't been able to find anything online about "ID LEDs."

(Original question edited because more than one question being asked.)

Answer

The Chassis ID light is there to make it easy for you to identify which of the many server boards in a rack is the server you want to find. You mash the button, go around to the back of the rack, and the blinking light shows which is the server you want.

PS: Multiple questions within a question are problematic. Please limit the scope of what you ask for, by posing one issue per question. It's OK to make multiple posts on a project such as this, and editing this question down lets you close this out now you've got the answer, and move on.

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