How to find out what a dongle is for

I just got a new computer. When I was switching them out, I noticed a dongle in a USB port in the back of my old computer. How do I find out what that dongle was for? What software did it run? It's been several years, and I can't remember what it was for.
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More about find dongle
  1. Look up it's model # and brand in a search engine.
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