You got the message wrong, let me put it in the other way.
we created a NT user (alfresco.admin) and marked him as a administrator in a xml file in the alfresco folder. So now a admin user has been created as 'alfresco.admin'.
so this 'alfresco.admin' users can - Create user groups, users and manage spaces.
Consider my case, i am normal user, my manager wants me to manager a particular space, user groups and users. managing a space can be achieved as u suggested, in addition i need to manage user groups and users (currently it can be done only by the administrator (alfresco.admin)).
Hope i am clear with my requirement.
is it possible to stop a space access fro administrators. Let me know.
Narendran.S