How to set a valid USERNAME parameter for a silent installation of MapInfo Pro

Products affected: MapInfo Pro™
Some Administrators perform silent installations in shared environments where MapInfo Pro will be accessed by multiple, different Users, and frequently ask about the USERNAME parameter and whether it can be left blank, etc.

Engineering has confirmed that the USERNAME parameter cannot be left blank.
However, the USERNAME supplied does not need to be a specific name of an actual user (i.e. "Jimi Hendrix"), it can be set to something like:
"GIS Group" or "MapInfo Pro User"

For more informati0on on Silent Installation of MapInfo Pro, see Appendix B of the MapInfo Pro User's Guide
UPDATED:  December 6, 2019