Hi all, I'd like some advice please. I've been told that you can use an iMac as a second screen for a Windows laptop. First of all is this possible? I've tried using a VGA to thunderbolt adapter and nothing's worked. I've then tried an HDMI to thunderbolt cable, Command-F2, various options and settings. Different Macs have been tried as have different Windows laptops but nothing displays. I'm aware it would be easier to get a standard monitor and use that but the person I'm asking and testing on behalf of is adamant this can be done. Thanks in advance.