Years ago, I was working for well known lighting manufacturer and CD inventor you know who I mean... they had a SAP system that did not have a printer driver for the thermal printers they were using on all their products. I'd been using a bizarre pseudo mark-up language called SAPScript on a couple of projects and discovered quite by accident ;) that you could encode printer commands directly into the SAPscript. Exactly the same principle I guess as including php code in HTML. At some point the machine knows to parse the code not print it. I could get it to do some mad printed stuff as long as you could controll the variables that you passed to the script. I never tried the burn baby burn effect though. I was too nice.