[Samba] Complete format-description of smbpasswd?

[TeeCee]

Hi!

  I want to control the users account stored in smbpasswd from a PHP file, so 
I found a description for 3.0 on address: 
http://hu.samba.org/samba/docs/man/smbpasswd.5.html
  It is very good, but I have an account flag like 'UX' and the 'X' flag is 
not written. What does that mean? Are there a complete documentation 
somewhere or this is just a mistake from my old samba 2.2.6a (now I have a 
working 3.0.2a).

Awaiting Your Answers, Thank You:
    TeeCee :o)