Apple Mac OS X Server (Administrator’s Guide) - Manual (Page 77)

Directory Services 77
While some devices may need to be used only by specific departments, other resources, such
as personnel forms, may need to be shared by all employees. You could make a folder of
those forms available to everybody by setting up a share point for the folder in another
shared domain that all computers can access.
The shared domain at the top of a hierarchy of directory domains is sometimes called the
root domain.
Repro
domain
Company
domain
Graphics
domain
Graphic artists Copy center personnel