his is the test/debug mode of the new-printer dialog of system-config-printer.

Options:

  --setup-printer URI
            Select the (detected) CUPS device URI on start up
            and run the new-printer wizard for it.

  --devid   Supply a device ID which should be used for the
            setup of the new printer with "--setup-printer".
            This can be any printer's ID, so that driver 
            selection can be tested for printers which are not
            physically available.
)