HP UPD - System Administrator's Guide HP UPD 5.6.5

FAQ
1. For non permanent instance installations of the HP UPD will the printer be queried every time?
For cases where a user has chosen to create a permanent instance of a printer, settings are
permanently saved to the local registry (like any other print driver) and the user would continue to print
to that permanently created instance. For cases where a user has not chosen to create a permanent
instance of a driver, registry entries are saved in a .CREG file (cached registry). Initially the driver will
attempt to save the CREG files to the "C:\Program Files\Hewlett-Packard\HP Universal Printing"
directory. If that directory is not available or is locked, the driver will attempt to cache settings in the
%TEMP% then %TMP% directories. If neither of these directories are available then the HP Universal
Print Driver will query the printer every time for non-permanent instances.
2. How does enabling or disabling the Microsoft port Enable bidirectional support impact the HP UPD's
bidirectional communication?
The HP UPD uses the MS port’s bidirectional communication for basic status level related to print
spooler operations such as Printer Online and Paper Out. However, for product configuration and
capabilities the HP UPD uses its own installed services for bidirectional communication between the
HP UPD and the target product (NET DRIVER HPZ12 and PML DRIVER HPZ12).
Figure 7-6 Enabling bidirectional support
3. Does HP UPD Printer Autoconfiguration bidirectional communication cause slow print performance?
No, the traffic send/receive response is very small (SNMP around 65 kilobytes) and infrequent. For
traditional mode installation, the HP UPD only queries for printer information at time of installation,
when executed through Update Now or RUNDLL32 at the HP UPD installed client, and for a simple
change id at the beginning of Printer Automatic Configuration job to verify that the configuration has
not changed.
82 Chapter 7 Use the HP UPD ENWW