about extended memory

Hello Reders
In my system i have an extended memory of 129024 k.b
which is 126 M.B when i click the system properties
i use to get 129520 K.B where does the remainng 484 k.b
comes from? apart from extended memory
shadow ram 384 k.b
basemmemory 640 k
cahe ram 256 k
my question what are all comprise entire RAM?
does it include base memory?
or does it include shadow RAM?

Its your [Base Memory + Extended Memory]