In terms of voluntary control mechanisms on the Web, each protected area, whether it be a single document or an entire server, is called a realm. When a server challenges a client for credentials, it provides the name of the realm so the client can figure out which credentials to send.

The name of a realm is specified in the Apache configuration files with the AuthName directive, which takes a single argument: the name of the realm.
The ScreenCast session explain how to apply it, look to the desktop recording of realm creation .

In this example we will apply a REALM to the test location:

 <Location /test>
    AllowOverride None
    Options None
      AuthType Basic
      AuthName "Protected Area"
      AuthUserFile /mnt/flash/.htpasswd
      # only authenticated users may access this location
      Require valid-user
</Location>

• http://apache-server.com/tutorials/LPauth1.html
• http://httpd.apache.org/docs/1.3/howto/auth.html