ttyS0

An aerofs server is used to help establish a "connection", more or less along the lines of http://en.wikipedia.org/wiki/STUN

Obligatory xkcd reference: http://xkcd.com/949/

I would say AeroFS is as easy as it gets when it comes to transferring large-size files between computers on the Internet. I use AeroFS to share photos and videos with my parents across the Pacific. Works pretty well.

To save you time, you can skip the initial rant about how closures are not taught in universities and start reading from the heading "A Concept Explained Simply".

Yes, because we all know that when we run these systems outselves, they never go down.

By crippling 3rd party software, Apple is hurting its platform the way Microsoft is hurting itself. Whether or not the hurting is intentional is beside the point.