Riddle

A closed shell I lie,
An opened one I usually am.
I know of no boundaries,
for I explore with ease.
I have lived many years in the shadow of accomplishments,
unheralded,
but forever faithful to serve should need be.
Knowledge and information are my watchwords,
which I manipulate with ease,
Never tiring, never ceasing.
Power is everything,
without it, I am nothing.





What am I?