EXS 24 Logic Sampler Users Group

Hi there, I'm a new user to Logic 5.5 on Mac OS X and I've recently begun using the 
EXS24.  I was curious to know what the EXS24 INSTRUMENT EDITOR is, which is 
located in the AUDIO menu.  I've looked in all the manuals and none of them explain 
what it is.  It appears to be a way of loading samples (duh).  Eventually i would like to 
produce IDM music where I would use my own samples to create beats, thus 
the instrument editor may be a big help.  Hope someone can help.

Thanks!

Henry