(There's no video for MacDTA yet. Please contribute to MR and add a video now!)
Hard to imagine today, but there was a time in Germany where when you wanted to bank transfer money (wire transfer) you could either fill out a form at your bank - or use your Mac to write them to a floppy disk and hand the floppy to your bank. Seriously. You just had to keep it in the DTA standards format ("belegloser Datenträger Austausch") so the bank could automatically process your bookings.
The offer didn't gain widespread popularity, but was picked up by some small businesses who would usually type their transfers into a program, save it on floppy in DTA and hand it over to their bank on a (bi)weekly basis for processing.
MacDTA is one such application for the Macintosh that would allow you to type in your payment details and save them in a DTA-compatible format on floppy. It's unregistered software (please supply a key!) and German language only.
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/ compressed w/ Stuffit
Emulating this? It could probably run under: SheepShaver