A register never argues back — but it also never reminds, never backs up, and never adds itself up.
The register works because it is simple and always in your pocket. It fails quietly: a page gets wet, an entry is missed, the total is off by a zero, and there is only one copy in the world.
TameerBook keeps the simplicity of a khata — a running balance per customer — while adding the things paper cannot: reminders, a backup that cannot be lost, and a total that is always right.