iMac ok to use with (normally Windows operated) Barclays BARX trading platform?

Hi. I'm hoping that someone can help as I'm getting conflicting information from Barclays Stockbrokers. I'm about to purchase an iMac but am unsure as to whether I will be able to operate BARX on it? I know this is quite niche but does anyone have any experience in this?
Thanks....

No experience with it, but most likely it's Windows only. Which means that you can probably run it in a VM with Parallels, Fusion, or even the free VirtualBox from Oracle. Or, you can install Windows on the iMac using the Boot Camp Assistant. Of course that means you will need a legal copy of Windows. (Boot Camp or VM method.)