Red optical connection at right-hand side

This document used to say ``At the right-hand side of the laptop, behind the CD-RW/DVD drive, there's a red led in the case. I don't know what it's called, but it is an optical connection of some sort.''

The nice bit about writing documents such as this one is that people tend to send you mails explaining what stuff is, if you don't know by yourself...

I've had two people mail me that the optical connection at the right-hand side is an S/PDIF optical audio output. You'd need an amplifier with optical inputs (I, myself, never heard of that), while apparently some digital recorders (such as a minidisc) have a connector that can do stuff with such output.

Well, now I know what it is; if someone could tell me whether it works, I would be a happy man.