null session %U expansion (patch)

[Luke Kenneth Casson Leighton]

> 
> Unfortunately this would break browse mastering and password changes. Both
> Browse synchronisation and password changing are done via an anonymous
> connection.

ok, password changing: that's a good thing (you're referring to win95 and
below password changes).  nt password changes i have seen send a
username/domain/password to log in and _then_ send the password change.

browsing: that's slightly bad, and for that some exploration of the nt
browse mechanism should be done.

luke