Thank you very much Darrel and @mallow76. I appreciate the information. However, I wonder how some of these variables are read (do they need a trigger – if so how do I tell Moodle to read them?).
Or… does the SCORM engine in Moodle read them (and all I have to do is set them)? In some ways it might be easier to get an LRS (xAPI) to read the information but it takes longer and is less convenient (at the moment) than using standard SCORM.