>Excuse me for being Obtuse, but do you mean if I use ???, that I don't need to worry about OPOS?

I'm not saying that you don't need to worry about oPos, but since you used "???" in your post, I thought that I'd mention thats how I print to reciept printers. Its pretty simple, and if you abstract enough, supporting a different printer type doesn't take alot of work.