Well, it appears you can't assign mapkeys to the Page Up or Page Down
keys. Lots of people sent me mapkeys to switch sheets, but no one knew
how to assign them to the keys I wanted. I thought those keys would be
most intuitive for my users. I guess I'll either stick with my PV
(previous) and NX (next) or try the + and - keys, as some suggested.
I'm thinking the + and - on my SpaceExplorer might work for this, too.
And then there's the hope that the one person who knows how to do this
and was holding out on me will read this summary and reply with the
answer. Seems like sometimes a summary generates more responses than
the original post.
Thanks to all who replied. I've listed their responses below.
Bill
ORIGINAL QUESTION: