How can I use my iMac 2009 as an dual monitor with my Macbook Air 2012 13"
Title says it all,
Thanks
MacBook Air, OS X Yosemite (10.10), iPhone 6 iOS 8.1
User profile for user:
chris_g1
User level:
Community Specialist
Hello cbaudo,
Thank you for using Apple Support Communities.
I see that you want to use your iMac as a second monitor for your MacBook Air. The following article provides the necessary specifications and instructions for using Target Display Mode. Use your iMac as a display with Target Display Mode
From the limited specifications you have provided, it is very possible, but compare your exact system specifications with the system requirements in the article.
Best regards.