Question about loopback network interface

Hi,

I am looking for some information on how exactly the loopback network
interface works. I've done a fair amount of Google/StackOverflow
searching but haven't really found anything particularly useful.

In particular, I'm interested in 2 things:

1) A diagram of the 'plumbing' of what exactly happens when an app
communications with another local app using TCP

2) How "loopback-aware" is TCP? For example, does congestion control
still come into play when communicating over loopback? Or does TCP
always do the same thing, regardless of whether it's communicating to a
remote or local app?

Thanks,
Adam
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