public static Task <SOAPPrincipal> findPrincipalAsync(this SecurityServer s, AuthenticatedToken t, string u)
        {
            var tcs = CreateSource <SOAPPrincipal>(null);

            s.findPrincipalWithAttributesByNameCompleted += (send, args) => TransferCompletion(tcs, args, () => args.Result, null);
            s.findPrincipalWithAttributesByNameAsync(t, u);

            return(tcs.Task);
        }