MDB can refer to several technologies. It most commonly refers to the "Multidrop Bus", which is an interface protocol typically used in vending machines and other similar automated dispensing systems. It defines the communication and power interfaces between a master controller (like a payment system) and peripheral devices (like coin mechanisms, bill validators, or product selectors). Another meaning could be "Microsoft Access Database", which is a database management system from Microsoft. Without further context, it's hard to determine which one the user refers to.
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