An ATM system is provided. The system may include a back-end server, an ATM CPU that receives information relating to the ATM, an ATM dispenser configured to dispense a cash withdrawal amount in the event that the ATM CPU receives information relating to a selection of a cash withdrawal amount and a mobile computer. The mobile computer may include a CPU, a keypad, a touch screen having a diagonal dimension of between 9 inches and 17 inches, and an interface system that interfaces between the ATM CPU and MC CPU, wherein the back-end server is configured to format and transmit an API call to request information regarding an ATM session. The ATM may be configured to respond to the API call and the back-end server is configured to respond to an API call response. The back-end server response may be further configured for display on the touch screen.