[CentOS] Where to change login screen options

[Lars Hecking]

Wes James writes:
> I've looked around in the menus and googled this, but I can't find a way to make the login require a username instead of just showing the available users to select from. ??Where do I change this? ??I'm using CentOS 6.5.

 I'm surprised you cannot find this. It's a very popular topic across all OSes
 and distros that run Gnome.

 http://lists.centos.org/pipermail/centos/2011-July/115120.html

 Alternatively, you can edit /etc/gconf/gconf.xml.defaults/%gconf-tree.xml
 directly.