[JDEV] Remove user registration

[Ru-Shan Cheng]

Remove user registration

I have some questions about the topic:
1. What is the difference between unregistering a user and using the <remove/> tag?
   unregister : cannot login, and leave spool file?
   remove: remove user's spool file?
   
2. In 'Programming Jabber', the bottom of page 218,
   it said that the <remove/> tag has to be used in user session.
   Is there any method to remove an user's registration in non-user session?
   
3. I can't remove my registration using the method described in FAQ.17 
   at http://www.jabber.org/user/userfaq.html
 
   <iq type='set' to='jabber.org'> 
    <query xmlns='jabber:iq:register'> 
     <remove/>
     </query> 
   </iq>
   
   I used WinJab to send XML.
   I don't know what's wrong.
   
   Any clues will be approciated!
   Thanks!
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