In MX4 you just go to search and plug in last four of a card and up pops the transactions on that card. We currently have processed over 47,000 cards the first four months of the year at the college on our terminals. MX6 only searches if you process through t. Now we have to keep contacting our Agent to help us and it takes way too much time WE DO NOT HAVE to research a card. I use this tool in MX4 almost daily & without it I'm very upset!!! This is a MUST HAVE!!