A few days ago I was seeing some weird messages on our HP Jetdirect printer. Doing a little Google searching I found out that it is possible to send messages to HP printer so they show on the LCD display! I found this utility you can install on Windows. Just install it, enter the IP address of the printer and put your message in. The message will be erased if the printer is power cycled.
If you do this at the work place: use caution. Your IT department may not like you very much if they catch you sending messages to their printers. 🙂
– Soli Deo Gloria