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Helpful answers
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Jan 11, 2016 10:50 AM in response to tom ragsdaleby Duane,No. The 21.5" late 2009 iMac does not have this ability. Use your iMac as a display with Target Display Mode - Apple Support
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Jan 11, 2016 11:36 AM in response to tom ragsdaleby tom ragsdale,although i might try this, and see what happens... http://danielrucci.com/blog/2011/05/18/how-to-use-a-21-5-imac-as-an-external-dis play-with-some-elbow-grease/
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Jan 11, 2016 11:42 AM in response to tom ragsdaleby Duane,Hopefully that works for you. ScreenRecycler can be useful. Just be aware that it hasn't been updated in almost 5 years.