GDM passwordless login

How can i setup gdm so that two users need to give password and two not (only click their user names and press enter)(childrens).

I am not following your question. I'm not sure if you want two passwords, or none!
Noah

user1 needs to give password
user2 needs to give password
user3+4 doesnt have to give password

Oh! Alright, let's open up your graphical user manager, select the user you don't want a password for, and change the password. Just leave the "new password" blank. If you want to add a user without a password, just leave the password blank.
Noah

Old post, I know. But I need the same thing. I just started using gnome/gdm and want to enable passworldless login for 1 user. The above tip doesn't work, as a password *has* to be given...