Mulder holding a license plate used to trick C.O.S. to let him and Scully to the Eurisko building.

In the episode "Ghost in the machine" The Eurisko Corporation was a software company in Crystal City, Virginia found by Brad Wilczek and chief executive officer Benjamin Drake. After Wilczek leaves, Drake writes a memo proposing to shut down the Central Operating System (C.O.S.) project, a smart automated computer which runs the Eurisko Building. Seeing this through a surveillance camera, the C.O.S. sets up a trap and lures Drake into a bathroom, locking the door behind him. Drake tries to use his keycard to open it, but it rejects the card. When he inserts a manual override key, he is fatally electrocuted.

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