The Operator is a fragment of the Melissa (A.I) that was thrown back to the year 2004 after a explosion caused by a Forerunner articfact. The Operator is serverly damaged by the journey and is irratic, violent and confused while occuping the ilovebess.com server.
The Operator is known as The Queen by another Melissa fragment called The Sleeping Princess. When Melissa was the A.I. for the ONI star ship, Apocalypso, the crew called her The Operator or Op. This is the name she remembered and used as most of her memories are various flashbacks from the Apocalypso.