avahi: avahi (service discovery aka zeroconf)
avahi: 
avahi: Avahi is an Implementation the DNS Service Discovery and Multicast 
avahi: DNS specifications for Zeroconf Computing. It uses D-BUS for 
avahi: communication between user applications and a system daemon. The 
avahi: daemon is used to coordinate application efforts in caching replies,
avahi: necessary to minimize the traffic imposed on networks.
avahi: You must have an avahi user and group to run avahi.
avahi: Something like this should suffice for most systems: 
avahi: # groupadd -g 214 avahi
avahi: # useradd -u 214 -g 214 -c 'Avahi' -d /dev/null -s /bin/false avahi