[emeritus]

For my Epson 740 printer, to change a cartridge you could either use a menu option on the PC, or simply hold in the "clean" button on the printer for 3 seconds.

The Epson has only just been retired: it has developed a fault which results in the carriage not returning home properly after a pass, resulting in gibberish. A shame as it was excellent and could take paper of user-defined sizes.