I am preparing to do an import of a lot of data, and I want to properly map my data into CiviCRM. This is primarily for event participants of various kinds, so I exported the basic participation data to use as a template. There is a column therein called "Unique ID (OpenID)" that I can't locate in the Contact view or anywhere else. Some of our data already in CiviCRM has this populated, some not. It could have been populated via original import and is completely useless. Or not?!? I don't know.
I have tried googling for the answer, and all I come up with are two pages from the manual referencing data export columns that include this for Organizations and for Households, but not individuals.
There is an OpenID field that includes a location selector, but this implies a relational join to another table, not a single column in the Contact record (which is what I am looking for). And for those contacts that have the "Unique ID (OpenID)" column populated in the export, this field is NOT populated on the Contact view page.
So, what gives?