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A Promotional Spoof for the Empire was a fictitious advertisement promoting the Death Star Owner's Technical Manual, which appeared in Star Wars Insider issue 145.
The Sith Lord Darth Vader gets to the Death Star, where an Imperial officer with the rank of Commander welcomes him. Vader, however, lets the commander know that the Rebel Alliance has pilfered the blueprints for the Death Star. The commander points out to Vader that he doesn't possess the Death Star's schematics, and since he's unaware of how to run the battle station, he lacks any authority. At that point, Vader hands the commander the manual, explaining that it includes a comprehensive inventory of the station's capabilities. The commander examines it and discovers a significant weakness: a Thermal Exhaust Port.