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Chapter 5. Printer Features
has a printer attached to itself or if the terminal, part of a bigger location, is placed in its own room
together with a printer. You can read more about this administration in Chapter 16.
5.4.2. Nearest Printer Selection Algorithm
If a terminal has a printer directly assigned to it in the terminals module in tlwebadm, that printer will be
the nearest printer for that terminal. For printers without a printer directly assigned (the normal
situation), the first printer in the list of printers for the terminal’s location is selected when the user
submits a printer job to the nearest queue.
If a user has more than one session, print jobs submitted via nearest printer will be redirected to the
printer that is most near the client that made the last connection.
5.4.3. Printer Drivers
When printing via the nearest printer, the CUPS client can’t get hold of all information about the real
printer where the job will actually be printed, because it doesn’t know that the printer job will be
rerouted by the nearest driver. Therefore, the printing application has no way to know about the number
of trays, the paper sizes available etc.). This is a problem for some applications, and it also adds to the
number of applications that will be misconfigured, for example selecting the wrong paper size.
As a compromise, the nearest printer is configured with a PPD (Postscript Printer Definition) that covers
a broad range of printer capabilities - it’s a Generic Postscript Printer driver. This makes it possible to
configures default values for some of the settings, for example paper size, using the CUPS configuration
interface.
If all the printers in your organisation are of the same type, it may be a good idea to replace the Generic
Postscript PPD installed for the nearest queue with a PPD for the specific printer in use. That will let
CUPS-aware applications select between the specific set of features available for the specific printer
model.
5.5. Printer Access Control
In a ThinLinc cluster, all printers that any user of the cluster needs to be able to print to must be defined
centrally, or the user will not be able to print from applications that run in a ThinLinc session. For large
installations, this leads to a very long list of available printers.
A long list of printers leads to usability problems - having to select printer from a long list can be
troublesome. Also, it opens for problems with printer jobs being printed at remote locations by mistake
(or on purpose, by users finding it amusing to send "messages" to other locations).
The solution to this problem is the Printer Access Control feature of ThinLinc. By integrating with
CUPS (the Common Unix Printing System), the list of printers a user is presented with and allowed to
print to is limited to the printers that should be available to a specific terminal, based on information in a
database of printers, terminals and locations.
Note: The Printer Access Control feature will affect all users on the ThinLinc cluster. The only user
excepted from limitations of the printer list is the superuser (root) - all other users will only see and
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