by 
Scifisuz
ANSWERS: 3
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typically they're keys that don't have a specific function, like you can assign them to do a number of things.
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If we're talking about phones, they're the buttons that do different things depending on what's on the display. I have an ancient Mitel phone on my desk. If I hit one button I get to the phonebook. But if I hit a different button I go into a menu system and that same key takes me to call forwarding options.
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You could be talking about the files that are used to update the software on some programmable satellite receivers.
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