HT202780: OS X: Using multiple displays in Mavericks
Learn about OS X: Using multiple displays in Mavericks
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May 19, 2015 11:11 PM in response to davisdesignincby Kappy,Target Display Mode- Frequently Asked Questions (FAQ)
Target Display Mode 2011 & Later iMacs
iMac- How to use your iMac as a Target Display Mode display
It can be used to mirror a display. I don't believe it extends the Desktop, although I have seen this discussed elsewhere, so I cannot say positively.