Question about CLASS= & classname

[Aiello, Steve (GE, Corporate, consultant)]

Per the hobbit-clients.cfg documentation I read the following:
    CLASS=classname Rule match by the client class-name. You specify
    the class-name for a host when starting the client through the
    "--class=NAME" option to the runclient.sh script. If no class is
    specified, the host by default goes into a class named by the
    operating system.

My questions:
The default classname setting of the operating system, which value is it
? When I look at the client data of a host I see the following:
   [uname]
   Linux serverName 2.6.16-gentoo-r7 i686
   [osversion]
   Gentoo Base System version 1.6.14

Is the default value of classname set to [uname] or [osversion]. Also is
it the full name ? If so do I define my CLASS="Linux serverName
2.6.16-gentoo-r7 i686" ? Can regular expresion be used, CLASS=%Linux.* ?

Can a host be defined to more than one class, i.e.
   1.2.3.4   serverName   # ssh CLASS:Linux CLASS:webServer

If a host can have more than one class definition, what happens when you
get CLASS configuration parameter collision ?

Also, it may bee helpful to have the Info report show which class the
device falls under.

Thank you,
  Steve