what are you talking about specifically? your question is very ambiguous.
LinuxMCE, like its close cousin, Pluto, can stream video to any of its connected machines (called Media Directors) throughout the house, either individually, or in groups simultaneously. It does this by sending the video streams from the machine that has the media (typically the CORE), to the other machines requesting the stream. Since this is over TCP/IP... I guess you could call it IPTV... or are you referring to some proprietary protocol?