LPRINTPRINTER StatementWindows

A statement just like PRINT except all output is directed to the default printer. Make sure to call LFLUSH to start the print job.

Syntax: LPRINT [expressions][{;|,}][...]
LPRINT "print this line"
LFLUSH

Details:
You should call LFLUSH after you're satisfied that you want to start printing. If you don't call LFLUSH, then whenever your application terminates is when your document will start its print job.