if you're asking if your md will detected automatically, then yes, with .40 you only need to boot the md over lan and you'll get a popup screen asking if this is a md, you need to assign a room for it.
in .39 you needed to go to pluto-admin, create a room, add new device 'generic pc as md' then supply the mac address and do the setup diskless to get an ip.
mec is indeed a version of media center which we tried to implement, you need to add 'generic pc as md' though.