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Constants (GPD language)

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Important

The modern print platform is Windows' preferred means of communicating with printers. We recommend that you use Microsoft's IPP inbox class driver, along with Print Support Apps (PSA), to customize the print experience in Windows 10 and 11 for printer device development.

For more information, see Modern print platform and the Print support app design guide.

Constants are named values that are predefined by the GPD language. Constant names typically consist of capital letters. Example GPD constants are PAGE, SERIAL, and TTY, which are values that can be assigned to the *PrinterType attribute.