- Hewlett-Packard Printer Owner's Manual

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To select a printer in multiple printer applications, the computer sends
the Printer Select Code (which consists of any ASCII character string
numbering from one to eight characters) followed by the desired
printer port number.
The Printer Select Code is trapped by Print Master if it is valid and not
passed to the printer. This code may be sent by inserting it into a file
or by using BayTech's memory resident port select program which will
automatically send it by striking hot keys or using a mouse.
Section 6.2 discusses how to use the Printer Select Code to select
printer ports.
Factory default is
$PRINTER
.
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In multiple printer applications, you can choose between two methods
of selecting printers. Mode 1 allows the computer to select the printer
at the beginning of printing only. The unit is transparent after 16
characters or more. Mode 2 is a general-purpose mode which allows
the computer to select a printer anytime while printing by sending the
new Printer Select Code.
NOTE:
In Printer Select Mode 1 (beginning of printing only) the
Model 706A and 708A will recognize the printer select code only if the
very first characters of the print job contain the printer select code.
Factory default is Mode 2: selection anytime while sending.