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The SpinDoctor

macrumors regular
Original poster
Nov 22, 2008
190
18
This may sound silly, but can the iMac be doing tasks (i.e encoding in Handbrake, downloading through transmission etc) while you are using it as an external display?
 
AFAIK the iMac remains doing his operations while in target display mode, he also needs to run for using an external video input.
You should be able to switch between the internal and external video input with CMD + F2
 
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