Is there a possibility to differ virtual printer from physical one?

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I don’t think it’s possible, at least with any certainty. The whole point of a virtual printer is to imitate a real one as closely as possible, so any differences you can identify are basically just bugs in the virtual printer.

That said, you can make some guesses based on the PortName. Just for a couple of examples, a PortName that includes an IP address or starts with “USB” is likely to refer to a physical connection.

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