m300 and m600 mediabase question

I'm looking for a more portable laptop than my  inspiron 7000 (affectionately refered to as "backbreaker")

(Dell must come up with the model number from its weight!) 

I've been looking at the m300 and m600.  The website says "  For an enhanced set of system features, dock the 300m on the optional MediaBase for subwoofer-powered audio, extended battery life with space for a second system battery, and easy access to internal optical drives.  " 

Does anyone know if this "docking" means that I can carry around the ultra light laptop, and then bring it home and plug it into the media deely-bob?  I'll never make it thru grad school with this inspiron! (well...not without looking a bit more quasi-modo than when I went in!)  The info sounds as if it's something we can hook up ourselves and dock at will?

Help!

thanks in advance!