R help - Oct 2009 - Confidence intervals and p-values of ARMAX model

Is there any way to get confidence intervals and/or p-values in the ARMAX 
model?

I tried the search using:
?ar
?arma
?arima

But, AFAIK, "ar" and "arma" don't accept exogenous
(independent) variables,
and "arima(x, order, xreg)" does not return statistics on the xreg
terms.

BTW, just in case someone tries to get this information from Wikipedia,
the entries in articles "Autoregressive model", "Autoregressive
moving
average model", and "Autoregressive integrated moving average"
that mention
R were written by me - so there's no point in repeating them (but 
corrections are welcome!) :-)

Alberto Monteiro