Re: what the fuck does PC LOAD LETTER mean?
...Or custom text, such as "FEED ME JELLY BABIES!"
There's a very short PCL script you can feed to a printer to set the idle display to whatever you want, too. I'm fond of "SKYNET CONNECTED, AWAITING ORDERS" or "INSERT COIN" or "BBQ SAUCE LOW".
Best part is, if someone objects to your practical joke, power cycling the printer clears it out.