folder listing

I have been reading through the libEtPan API and am a bit confused at the
interface provided.  I hope someone can clarify some of my questions.

1)  As a developer, how do I connect to a generic mail server.  I want to
be able to have users conigure POP3, IMAP, etc.  Is there a generic way to
connect to mail servers, or do I need to do it different for each one? 
Specifically, my confusion on this issue comes from the example which uses
imap_mailstorage_init() to connect to an IMAP server.  I have successfully
connected using this method, but I assume this would only connect to IMAP
servers.

2)  What is the use of sessions?  I would have thought that a session
would envelop a storage, but it seems that the storage data structure is
what I pass to all the functions in order to retrieve messages and
folders.  How are sessions used in libEtPan?

3)  How do I get a listing of folders on an IMAP server?  There are some
functions listed in the session driver, but they are all depricated, and I
have not found any reference to "lsub" in the etPan client, or in the
libEtPan documentation.

Thanks for your help.
Luke



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