Programming for multiple version of EXCEL
 

I posted this under "New Users" before i discovered there was a programming
group sorry!

I am going to start a vb.NET program that will be used on multiple
computers. Some have EXCEL 2003 and some have 2000. My development machine
has 2003.

If I supply the interop DLL from my computer to the machines running 2000
will my program be compatible? should I try to go the other way around and
copy the interop DLL from a excel 2000 machine? is this legal?

what is the best way to go about starting this project? I only want to have
to code once, and I dont have enough copies of EXCEL 2003 to go around to
everyone.