Cash Register Express

Cash Register Express (by pcAmerica, backed by Heartland) is the absolutely terrifying, unquestioned monolithic apex predator of the "Legacy Convenience Store" market. It is an indestructible, deeply entrenched Windows-based workhorse. It is the absolute weapon of choice for massive convenience stores and liquor chains who mathematically demand a highly robust, on-premise system that handles thousands of daily micro-transactions.