[Techtalk] [OT] What's a CID?

[Dan Richter]

 From time to time I get e-mail (written in HTML) which includes links 
like this:
[A HREF="cid:031401Mfadb4$3f3dL708$73380718 at 57W81af70Re"]example.com[/A]

The text of the link can also be an e-mail address. What is the meaning 
of that?

-- 
    Truth is incontrovertible: ignorance can deride it, panic may
    resent it, malice may destroy it, but there it is.
               - Winston Churchill