I have network printers setup under Red Hat Enterprise 3. They are presently configured using "raw device" for the printer driver. Most of the printers are HP lasers.(HP5 & HP4000 series, if that matters)
They are setup as raw devices because we send HP <esc> sequences through to control fonts and layout. (Older legacy software) I would like to be able to configure a network printer to accept a PDF file and print it, just by sending the file to the printer. (i.e. lp -d<printer_name> testfile.pdf) Is this possible and if so what is involved to configure CUPS to allow the process? Any help would be appreciated.

Try the search function, this has been asked and answered before. More to the point, you're paying for the Red Hat support, its sometimes quicker to call them