Could you elaborate on the the different notions of identity in, say, "chernenko@mcvax.su" vs. "mcvax!moskvax!kremvax!chernenko"? Is it because the "@" form is

Could you elaborate on the the different notions of identity in, say, "chernenko@mcvax.su" vs. "mcvax!moskvax!kremvax!chernenko"? Is it because the "@" form is more stand-alone while the "!" embeds with it a sense of what you think others might think is notable?