Another test flying aboard " Columbia " was the " Portable In-flight Landing Operations Trainer " ( PILOT ), a laptop computer simulator that was flown to qualify its use as a tool for helping the mission commander and pilot maintain their proficiency for approach and landing during longer duration Space Shuttle flights.
22.
For example, the original SHRDLU program ( an early natural language understanding program ) cannot be run on any modern day computer or computer simulator, as it was developed during the days when LISP and PLANNER were still in development stage, and thus uses non-standard macros and software libraries which do not exist anymore.
