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For example typing on your real keyboard: "P104S40E" will load and execute the re-entry autopilot; "P903S42E" will load and execute the ascent autopilot with a launch heading of 42 degrees. If you use the panel's keyboard you must click « PRO » 110 « SPEC » 0 then click « ENT » to load it and « EXE » to execute the loaded program (in this example atmospheric flight) You can also either simply stop the autopilot and keep it loaded with button « STOP » (space on keyboard) or stop it and unload the program with button « CLR » (C on keyboard)