EthernetBonjour/ZeroConf for communication between 2 arduino

Hello everyone,

I have a project to communicate between 2 arduino (turn on/off LED and read the value by LDR and print it to serial monitor). LED turned on/off by pushbutton on the other board. I've done it before via TelNet, I have no problem with it. But I need to accomplish the same mission with MDNS (last time I checked, it uses EthernetBonjour/ZeroConf library). I try to browse it, but I went blank with the explanations. Has anyone ever try it before or have experience with it? I am new at arduino, so any help would be much appreciated