Using a simple for loop, you can send a PJL command
[https://jacobsalmela.com/change-the-serial-number-on-hp-printers-using-printer-job-language-and-netcat-ftp/]
to all of the printers installed on your machine. For instance, if you wanted
to change the display message
[https://jacobsalmela.com/freak-out-your-friends-by-changing-the-ready-message-on-hp-printers/]
on all your networked HP printers, you could loop through all the