HP Color LaserJet 5500 Technical Reference Manual page 192

Spooler Examples
10-12 Programming Tips
ECHO
STMSG
USTATUSOFF
USTATUS PAGE To receive notification as each page
USTATUS JOB
The following examples show jobs used by spooling
applications:
Jobs that monitor job progress and confirm job
completion
Jobs that notify the user to load specific forms or paper
Jobs that control printer resources and print selected
pages
Jobs that print a banner page followed by an application-
generated job (application specifies printer language)
Jobs that print a banner page followed by an application-
generated job (application does not specify printer
language)
In each example, the indented lines indicate commands
belonging to a print file created by another application.
To synchronize status readback
information. The application should
send an ECHO command before any
other status readback commands; all
status responses before the returned
ECHO response should be discarded to
ensure proper synchronization.
To display a customized message and
take the printer off-line until the
operator presses the On Line,
Continue, Job Cancel, or Reset key.
Returns the name of the key that the
operator pressed.
To turn off all unsolicited status before
specifying the desired USTATUS.
lands in the output tray.
To monitor job progress. Sends status
message when job has completed.