Apple is pulling the plug on my 2008 Mac Pro, so I'm planning to buy a new iMac (probably). My old Mac has a glorious 30" Apple Cinema Display. How can I share this display between both computers? The first issue is whether a new iMac can drive the 2008 Cinema Display as a second monitor---and what kind of adapter would I need to buy? The second issue is finding some kind of hardware to switch the Cinema Display between the Mac Pro and the new Mac. Is such a thing expensive? For the new computer, I have hopes on a really nice 27" iMac, with really solid graphics (to support Obduction). A Mac Pro might be tempting, but I suspect it would be more expensive for what I want to do. I'm not doing professional graphics, but I am exploring software development and am exploring some machine learning algorithms. This old computer still runs El Capitan, but that's the end of the line, according to Apple. Pity, since it has 8 CPU cores, 22 GB RAM, a decent graphics card, and 2 drives (one of which is a hybrid 1 TB drive). I think my best bet may be to install ubuntu on this computer. My concern is that the old computer will be vulnerable when Apple's security updates stop coming. Hope I'm making sense. Thanks in advance for your expertise!