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>After testing I realized that I have to rewrite the entire print routine in printer commands for the Epson LQ570e in order to print a barcode on the document. On the plus side, it would mean that the users would not have to choose the printer from a dialoge. I'm sure they would like that.

I'm not sure why would they have to pick a printer in the first place. You could use SET PRINTER TO command to change it programmaticaly.