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A small piece of custom hardware attached to a computer for some special purpose. Original the domain of copy-protection features for high-end applications [Dongle]s have fallen from favour for copy-protection, but are re-inventing themselves as [RandomNumberGenerator]s, secure key stores in cryptographic systems and so forth. If a device contains general-purpose functionality, such as a general-purpose [CPU], general-purpose memory or some IO facitilities then it's not a dongle, since the defining characteristic of the dongle is it's specialisation. in the 1980s and 1990s, dongles had serial interfaces, but most modern dongles are [USB] [Dongle]s. ---- CategoryHardware
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