video-streaming or video showing on multiple pc via intranet

hello everybody,
i am looking for a solid free or low cost software
i want to show music-videos from 1 master-pc to 3 slave-pc monitors/beamer
in our company-intranet
the slave-pc should allways standby und should only one time pepared to
receive video
if i start a video on master-pc it should be shown immediately on the
slave-pc
i search for a easy to install und solid solution
please help
thanx and nice greetings from cologne/germany
manfred