[CentOS] Is avahi essential?

On 01/14/2012 04:19 AM, Timothy Murphy wrote:
> If running mediatomb avoids the necessity for Avahi,
> can you give a concrete example of a situation where Avahi_is_  needed?

I did.  "If two PCs were running a collaborative editor, like gobby, 
they'll use mDNS to find each other. Chat clients such as GNOME's and 
iChat will locate other chat clients on the LAN if configured to do so. 
  Rhythmbox will use mDNS to locate DAAP servers for media."

CUPS will also use Avahi to locate networked printers.