I know there is a lot of Q&A on this subject online but I haven't got
any to work on my Excel 2003.

I need to create random integers (up to 160,000) that do not
duplicate.

Actually it would be even better to have something that randomly
chooses (non-duplicating) cells from another worksheet (ex. choose
randomly A1:D40000, unless the cell is blank), but I can do the rest
of the leg work on my own if that is too complicated for me to
understand.

I plan to learn more at some point, but my VBA knowledge consists of
being able to copy and past code, and when that doesn't work, I'm
stuck.

Thanks!
k