You cannot use an empty password as this is blocked in the authentication
system.
But as Caleb says you can use any password as long as it is set for that
user.
Then you can pass the username and password in the URL like the login form
would
Ludovic
2011/11/11 Legeinfo <vl(a)legeinfo.net>
  Hi!
 It is possible to login in xwiki as a user without password? I want to link
 from a software in my Hospital to xwiki. The only variable a have is the
 real-name and user-name. I think about a login via velocity script with a
 special admin user/password as a bridge component.
 Hospital system ------------------------------> xwiki
 username "foo"                                           foo
 admin              ----open xwiki--------------->
 pasword
 --
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Ludovic Dubost
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