As far as I can tell, no it's not specified. I found some limited discussions on it's use but only as options against header/Location. I'm still going over the specifications though. Perhaps there is an additional header that can be sent with Location to get the same affect?
I'm also looking at the fact that no output is supposed to be sent before a header() call. This could be the reason the cookies are not being expired?
I guess I'll keep going over this but for now the header/Refresh does seem to work.
