Something that is piggy-backed is something that is riding on the back of something else. To piggy-back (or to go on a piggyback ride) is to ride on someone's back. This expression is used in several contexts, not least in electrical engineering, computer engineering and computer science.
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... split a number of times in its history. Many of these historic splits have been resolved. From the continuing branch churches, some have split in turn. Only some of the ...