Dark Forces Manual: Coded Transmissions was the game manual included in all boxed copies of Star Wars: Dark Forces.
The manual contained the original version of Kyle Katarn’s backstory. This version was later contradicted by Jedi Knight: Dark Forces II andDark Forces: Soldier for the Empire (although the writers acknowledged and adapted portions of it). The Dark Forces Sagaattempted to explain this by stating that Jan Ors was lying about Katarn’s history in an attempt to convince Mon Mothma that he was trustworthy.
According to The Dark Forces Saga, the transmission from Jan Ors to Mon Mothma was sent sometime between Katarn’s defection to the Rebel Alliance and his first mission for them.