ON 20010330@11:49:42 PM at page:
http://techref.massmind.org/techref/printer/hps.htm
JMN-EFP-786 James Newton added 'Says
http://www.hp.com/cposupport/printers/support_doc/bpl01965.html#P114_5892
PJL commands can do some front-panel functions programmatically. The following page suggests some possibilities: 
'