This is a daemon which runs on Howl clients to perform Zeroconf service discovery on a network. mDNSResponder must be running
on systems that use Howl for service discovery. mDNSResponder should not be running otherwise.
执行man mDNSResponder,里面的NAME和DESCRIPTION段的内容如下:
NAME
mDNSResponder - mDNS service responder daemon
DESCRIPTION
The mDNSResponder daemon publishes and browses available services on a link according to the IETF Zeron-
conf (aka "Rendezvous") draft standard. Only one instance of mDNSResponder needs to run on a host. Once
started, mDNSResponder runs continuously.