: It cannot request data from a device by sending commands; the device must be manually triggered (e.g., by pressing a "Print" button).

For example, a very old version of or WinZip had a bug where entering a license string that summed to "232" in hex would trick the offline verifier. This led to the urban legend that "232" is the "master key."

: You cannot use complex regular expressions to filter data; it only takes the first available value.

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