Manufacturer, designation etc…
I don't really know my way around, but I would suggest that you take a look at the bottom, I have important information about the device there.
Yes, that's right, but I'm not on site, I'm only at home and access the device remotely
Which operating system?
Win 10
Just go to the first menu item in the apple menu. It's called "About my Mac" or something. The exact model and device data will be displayed there.