The onboard flight software (OFS) has many components, and, the OFS was originally built at Draper/MIT for the Apollo. (Draper also contributed to the Space Shu

The onboard flight software (OFS) has many components, and, the OFS was originally built at Draper/MIT for the Apollo. (Draper also contributed to the Space Shuttle software). As in Unix, core OS components are used by other software components; in this case, Hal Laning's OS/executive was used by the guidance software (Hamilton's team). No, she didn't write all the guidance code, the team did. No she didn't write the executive/OS, but the guidance software used the executive. All the visibility she got about saving the mission is because the process overruns that caused the infamous alarms occurred during the lunar descent phase of the mission. In the Twitter thread it reads as if Hal Laning was never recognized. But he was, many times, and received awards and made great contributions. Even the Space Shuttle programming language called Hal/S (which I used during my Shuttle days), was named in Hal Laning's honor.