Where is the sync folder's compliment?

FIRST, we may be naive, but how do we specify the counterpart to the network
file we need to sync? To sync a network file we mark it as 'Always
Available Offline,' but where do we tell it what folder to sync with on our
local computer? I'm doing a bunch of synchronizing and have no idea what it
is being synchronized nor where!

SECOND, is there anyway to synchronize two folders on the same computer,
either on the same, or separate, drives? I.e., this is in contrast to a
network folder. We often download office files and would prefer to
synchronize them right on the same local computer.

THIRD, is there anyway to synchronize a whole drive, other than selecting to
sync all the individual folders?

Thank you for any help with these items!