You can read (in a sense, share) the files from database files (mdb)
independent of version (2002, 2000). What you cannot do is run procedures
and modules from one version on a program of another. If you have procedures
inside your mdb (procedures and data together), then you must convert the
database from 2000 to 2002 in order to run it. Going backwards you must
check you don't have procedures not supported by the older system, then
convert.