The crossword solution for the term UNLEASHES (UPON) is SICS, which stands for 'Simultaneous Information and Computing System'. This system was developed in the 1950s by IBM as a way to allow multiple users to access a single computer at the same time. It was the first of its kind and allowed for the sharing of data and resources among multiple users. The term UNLEASHES (UPON) is used to describe the process of allowing multiple users to access a single computer simultaneously.