Terms specific to Citadel, and to email servers in general.
Aide - this used to refer to an Administrator. Today, it refers to a virtual
agent that informs you, the site operator, of important happenings on the system.
EUID - Element Unique IDentifier - a random string in emails, or in the vcard; else EUIDs
may identify editable message in Wiki or DAV rooms.
GAB - Global Address Book - a dictionary of users and their vCards across a Citadel site
