To repeat Senor Snrub :

"Also, when there are the exact same values in two different cells, I
want to
be able to find both cell addresses. For example, LARGE(B3:Z51, 3) will
find
the third-largest value, and LARGE(B3:Z51, 4) will find the
fourth-largest
value. If those two values are the same, how do I find their
corresponding
addresses?"

I can sympathize ; I've struggled just the same. Regards.