Squashed commit of the following:

commit d36aba1463cf8dca9dea7b4e436a71c6821f341a
Author: Bill Napier <napier@google.com>
Date:   Tue Aug 11 16:36:07 2009 -0700

    Change disconnect to be the same as if the user had issued a done command.

commit 4ab3ef149e815188105e10febd5a00ee5d0574fc
Author: Bill Napier <napier@google.com>
Date:   Tue Aug 11 16:31:16 2009 -0700

    Add "done" command to allow multiple sessions.