QMS VMS Software Manual page 37

Activating the Hot Status Listener (HSL) application provides the host
with pseudo real-time printer message logging. The HSL receives
printer error and backchannel messages from DECnet-connected
printers. The HSL can then relay the message to OPCOM, a terminal
port, or to a log file in the original directory.
The HSL logs error status and backchannel messages to the print
file's directory under the print_file_name .LOG file when you're using
LN03 Plus or PostScript emulation if the appropriate command line
options were specified.
Whenever a printer error (such as media jam or paper out) occurs, a
message is sent to the operator console. Use the following command
if you want to prevent these messages from appearing on the con-
sole:
$ RELAY/DISABLE = PRINTER
This application also relays backchannel messages from user jobs to
the user. Refer to "Logging Backchannel Messages" in chapter 4,
"Queues, /PARAMETERS, and Logicals," for additional information.
Activating the HSL application is a two-step procedure with special
instructions given below for Phase V installations.
1 Enable the DECnet HSL option from the printer control panel
(Administration/Emulations/DECnet-TCP/IP/DECnet HSL
menu).
See the printer user's guide for instructions on navigating the
Configuration menu.