[css-mobile] relate to css handheld media type?

Hey gang,
 
I was just curious how this document relates to setting a css media type [1] to handheld.  Would this profile specify what properties I could use for my handheld css? 
 
Often handheld css's are implemented on top of the desktop css which mobile devices see.
 
I guess I am just confused how these all play together.
 
Cheers,
Justin
 
[1] http://www.w3.org/TR/REC-CSS2/media.html
 
******************
Justin Thorp
Web Services - Office of Strategic Initiatives
Library of Congress
e - juth@loc.gov
p - 202/707-9541