We do unix level printing - so what we did was just create a printer with dup on the end with a different print driver. So if you printed to printer123 - you got single sided. If you print to printer123_dup you got a double sided report. Then the user had the option to print any report duplex or single sided. Now - not many users picked duplex printing but it was available for any report. The init and reset strings had the escape commands in them. Then we did not have to change reports or anything like that.
PS - Now a days all our printers are pre-set with duplex printing.
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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