Cortana

From ILB

Cortana is an extremely powerful and intelligent Smart AI flashed from a clone of Dr. Halsey (http://library.psyjnir.net/?id=201).

More on Cortana via Halo Library (http://library.psyjnir.net/?id=215) and The Halo Story Page (http://halosm.bungie.org/story/cortana.html)