How is the work of software for ATMs, terminals built?

Question

Software and Internet Services

What is the software for ATMs, terminals mainly written on and how is the architecture built? Is it a regular desktop application that is deployed on each device or a web service that is accessed through a browser?
How is the work with scanners, bill acceptors, etc.?

Answer 1

Differently.
Where is the usual desktop application based on WinNT/WinXP
Where is Linux
Almost all ATMs are equipped with software written specifically for this bank.