Yes it is possible to use DLL call in ChUI programs to print bar codes. I have never done this, but I have used OCXes in GUI for the same purpose. I think there is a good DLL for barcode printing called StrandWare. I am sure there are a few others, it's just a matter of figuring out the call syntax from Progress.
HTH.
-Chris
------------------
Chris Schreiber
ProgressTalk.com Manager
chris@fast4gl.com