One of the earliest "indicator procedures" for the Enigma was cryptographically flawed and allowed Polish cryptanalysts to make the initial breaks into the plugboard Enigma. The procedure had the operator set his machine in accordance with the secret settings that all operators on the net shared. The settings included an initial position for the rotors (the "Grundstellung"), say, "AOH". The operator turned his rotors until "AOH" was visible through the rotor windows. At that point, the operator chose his own arbitrary starting position for the message he would send. An operator might select "EIN", and that became the "message setting" for that encryption session. The operator then typed "EIN" into the machine twice, this producing the encrypted indicator, for example "XHTLOA". This was then transmitted, at which point the operator would turn the rotors to his message settings, "EIN" in this example, and then type the plaintext of the message.