As the world descends on Copenhagen this week for the United Nations Climate Change conference, the city's police must manage protests, secure world leaders, and handle all the other issues that come with a major global event.

Perhaps surprisingly, the force is doing it with Macs.

The Danish Police Department isn't using Apple computers on the go, or keeping in touch with iPhones. No, the entire central command is now run by Mac Pros and Mac Minis, with not a single PC to be seen.

The Danish police force has been using Macs since 1996, running NeXTStep. But five years ago, the force needed to upgrade, as spare parts were becoming scarce.

It started looking around at what systems other countries were running, even touring the UK to find a setup that was innovative enough to catch the force's eye.

It didn't find one. Anywhere.

Karsten Hjgaard, Police Inspector and the driving force behind the upgrade, told IT PRO: "We were looking at the leading [systems] on the European Market to see what they were able to do for us we didn't like it and went back empty handed."

Then, two years ago, with the United Nations Climate Change conference looming, a decision needed to be made. The force's previous supplier Frontline suggested creating a bespoke system using Macs.