Thank you all, for your input.
I was looking for a simple solution, but it appears there isn't one!
This is what I want to achieve -
* Leave the image file number as is.
* In LR add a Title to a range of photos,
* Add individual Captions, in LR, to each photo.
* Then send the batch of photos to family, most of whom would not be using LR, & would probably open the photos in Microsoft Photos app.
# My test of that app is that the 'Info' button result is hit-and-miss whether it shows the Title or the Caption, or neither.
That was what I was hoping would be the simple way for the non-photographer to have a concise description of the subject of that photo.
That is particularly relevant to family historical images.
# This is the best I can come up with - I tell the family NOT to open each photo, but to right click on the thumbnail, whilst still in its folder.
Then click on Properties - Then click on 4th tab along to Details - There they will see -
Title - [as per LR]
Subject - [as per Caption in LR]
Obviously, I would like them to view the photo in full screen, & see the Title & Caption to a side.
The various EXIF readers Paul pointed me too, gave far too much technical detail, & the Title etc, if there at all, was buried amongst the data.
I cant be the only old photographer that wants to give all his family a SSD with a lot of historical photos [which may never be provided by anyone else!], plus photos of the kids & grandkids, over the years.
If the time-poor generation can't quickly see what that old B&W photo is about, it will be meaningless to them!!
I'm hoping that someone may still provide, not me, but my time-poor family, with an easy way of getting a short description of who that young guy in the WW1 Aussie uniform was - Yep, he was your Great, Great Grandfather, who landed on Gallipoli on 25 April 1915, got shot, survived, & that's why you're here!