 Roland and his ka-tet learn of his existence when Roland comes across a copy of "Salem's Lot", after first meeting Father Callahan in the fifth book "Wolves of the Calla".Roland and Eddie later confront King in his Maine home at a time when he has written "'Salem's Lot" and "The Gunslinger" but no further Dark Tower books.Roland hypnotizes King and it is revealed that the author did not in fact "create" the characters of Father Callahan, or Roland, or any others involved with the Dark Tower, but Stephen King is in this reality a channel (another servant of the Beam / ka / Gan) that records their ongoing quest.