where is the "catnc" command which in file /fai/class/01alias

[walker]

hi: I'm newbie to fai, in file  fai/class/01alias  has some line like 
the following:

# use a list of classes for our demo machine
case $HOSTNAME in
    demohost)
       catnc demo ;;
    gnomehost)
       catnc demo ;
       echo "XFREE GNOME";;
esac


I can't find the "catnc" command,  which package include the "catnc"?
any of your help will be appriated!
Best Regards!

walker