Originally posted by MrGongGong
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I remember asking when I bought one a new machine a few years ago whether I could use the old (large) screen to do 2 screen working, and was told that it would only work if they had the same version of Mac OS X - and a recent one at that. I have done shared screens over a LAN - there are several ways of doing that, but the performance is generally very poor. Things might get worse if the network is WiFi.
There are adapter devices - I've seen them used, but I don't think they are Apple gadgets. We had them at work to allow 2 screen working.
I think another option is plugging the devices together with some form of cabling, but then there are issues about which versions of Thunderbolt or Displayport are being used.
One option on some 2013 models (Retina - plus HDMI out) of the MBP is to use an HDMI cable with a TV or suitable screen. Our 42 inch TV is too big for sensible computer work, but fine for watching videios. Yet another option is to use an Apple TV - though that might not solve all problems.
I'll have to check out Target Disk Mode further - to see if it's something I already know about but haven't recognised the name.
PS: https://support.apple.com/kb/PH10725?locale=en_GB
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