This is an old revision of the document!
As of GetSimple 3.0, you can now have different user accounts to sign into the backend. As of right now, hooks are in place for plugins to develop user management. Other things such as user roles (rights) and logging of users' actions are not integrated yet.
If you want to create & use multiple users, you need to do so with a plugin or manually.
There is a multiuser plugin now available in Extend: http://get-simple.info/extend/plugin/multi-user/133/
Mutli-user functionality is working, but there is no interface to manage users in admin panel. These are the steps to manually create a new user.
XML
extension: newuser.xml
<USR>
element within that new XML file to have the same unique username created in step #2/data/users