dde in dos programs

Hi all, A person that I do {*word*137} work for is looking for a way to use
dde (dynamic data exchange) in a dos program running under windows.  I
don't think this is possible, and have told him as much, but he/we think
that there might be  a way to do this, does anyone know how that this can
be done, and if so, how?  Any and all information would be appriciated.