[Dev] persisting a preference

[Jeffrey Harris]

Hi Folks,

What's our current thinking on how a developer should go about
establishing and using what I'll call a preference, essentially a single
persistent value with a well-known name (in this case, I'm wanting to
persist the last directories chosen for import and export)?

We've got lots of well-known collections living in
parcels/osaf/app/__init__.py, perhaps that's the appropriate place for
preferences?  It doesn't feel quite right to me...

I'm sending this question to the list instead of asking one person or
another because
A) I think there might be different opinions, and
B) I'm hoping someone will write up a detailed example so that knowledge
can live on in the list, not just my brain :)

Sincerely,
Jeffrey