dongle-disk: /don'gl disk/ n. A special floppy disk that is
required in order to perform some task. Some contain special coding
that allows an application to identify it uniquely, others _are_
special code that does something that normally-resident programs
don't or can't. (For example, AT&T's "Unix PC" would only come up
in root mode with a special boot disk.) Also called a `key disk'.
See dongle.
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