If I open an IMAP stream to my machine without specifying INBOX and then do a get_mailboxes with a "*" I get all the files in my home directory. Should this happen?

If this is the case. How can I create additional folders for use in a web mail style app. If I create a folder called SENT would that actually create one in my home folder? or would it be virtual.

Also, anyone happen to know what folders are already available from IMAP as standard. So far I have only found INBOX.