I decided to take a scientific approach rather than a criminal lawyer approach, as I come from a scientific background.
I located the normal.dotm file on my main computer and copied it to the new computer that I was trying to program Ctrl-Shft-b and Ctrl-Shft-k to change highlighted text to blue/black.
Sure enough it worked.
Any highlighted text would change to blue/black with the above key strokes.
So now the only question that remains unresolved for me is:
How can I get into the workings/programming of normal.dotm to see how I
did it?
BTW, there are no macros and nothing under Styles mentioning blue/black
on either computer.