WebDAV: Get the list of principals (users)
TElWebDAVServer.PrincipalCollectionSet() method is used to get a list of principal collections.
Once the list of collections is obtained, you can call TElWebDAVClient.ListPrincipals() method for each collection to retrieve a list of principals at any depth. The method returns result as TElWebDAVPrincipalList filled with TElWebDAVPrincipal objects. Each TElWebDAVPrincipal object represents a single principal.