This is probably the easiest thing, but I can't find the answer using online
Help.

I simply want to setup cells in different worksheets or files where, if I
change a cell in one, it will automatically update in another. I'm talking
about straight data; Not formulas. Presently, they're different files
completely, but I can combine them into one file (different sheets) if that
will make it easier.

Any and all help is appreciated. Thank you in advance.