session, whether in a window, via ssh, or by some more esoteric means.
Its original reason for existence was allowing you to switch between
subsessions on a [video-display
-terminal](http://en.wikipedia.org/wiki/Video_terminal), but it grew to
+terminal](https://en.wikipedia.org/wiki/Video_terminal), but it grew to
allow sessions that could be detached and reattached (if you went home
for the day, or say you were connecting via a glitchy network) and
eventually to allow the same session to be simultaneously accessed