Re: Xserve and thin client
OS X server (server) is the system (software) OS X Server tools
The Xserve is a server machine configuration (to put in engine rooms, few connectors)
nothing requires you to have an Xserve to OS X Server, an imac macpro see is fit.
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OS X Server has an LDAP (openldap), it will boot into pxe and other mechanisms, we can manage the rules on the mac posts, however, is different from windows
Mac OS X Server can act as a client / master active directory.
it may also be a domain controller.
Re: Xserve and thin client
you realize that all your answers are just on Apple's site?
www.apple.com
Graphical tools are provided that implement a standard corporate directory / active directory, apple called it "opendirectory"
and OS X Server is relatively simple, yes. Everything is in place the basis for managing a small network of SMEs with administrative tools to "apple".
however, I am far from considering that balance 3 icons and buttons makes network administration "simple" windows 2003 is of great complexity and in any event so early that you want off the beaten path of active directory / opendirectory, you need to understand what ldap.