My mom used one in the 70s and 80s for accounting and billing in our local village. As I recall although they had multiple terminals to access it these were shared, you didn’t have a terminal on the desk. You’d pick the application you were going to use from a text menu, enter your identifier (no password), and make your entries. Actual billing runs or other accounting runs were done in batch overnight. When they upgraded to AS/400s everyone had PCs on their desks and used 5250 terminal emulators to access the system over SNA/APPC.

It was a "minicomputer". Nowadays they are called "midrange" computers and nearly extinct. They were general purpose computers, used for all kinds of of operations/calculations.

Most minicomputers landed in companies/departments too small to afford a mainframe and where used for inventory, POS, bookkeeping, payroll, etc.

My school district got one; I assume they did accounting on it. RPG would be a good fit for accounting. But also, they taught programming to us students. I learned FORTRAN on one of these in 1979. 4K RAM and punched cards.

I had to look it up, it is the ancestor to the as/400 family of computers.