wild guess, sir:
... get the interface (vla-getinterface ...)
... get the property documents
... open the doc required for print
... invoke the print method
... close the doc
... in between that there must be a way/method to set the printer, etc.
... to see all the methods and properties exported - maybe a import the table library via vlisp too, add your prefixes and then in the apropos search for those prefixes...
very mickey mouse help, but better than nothing.