Meaning of PIGGYBACKING in English
1. A method for passing acknowledgement frame s and data frame s in the same direction along a line.
2. The practice of increasing memory capacity by soldering chips on top of other chips. The chip-enable or high address pins would be connected to the address bus by a flying lead. Many Ohio Superboard s were expanded to a massive 8K of RAM in this way.
FOLDOC computer English dictionary. Английский словарь по компьютерам FOLDOC. 2012