Core
From LinuxMCE
Core is the term given to the main server with in the house. It is from this Core that allows whole house plug-and-play and lets you plug all sorts of devices anywhere into your home network--telephones, surveillance cameras, interface modules, audio players, etc.--and LinuxMCE will detect them and set them up automatically. It's like plug-and-play in Windows, but it extends throughout the whole house.