iMac (27-inch, Late 2009)

How to use 2 Apple iMac (27-inch, Late 2009) as Display monitors to the 3rd Apple iMac (27-inch, Late 2009) using the ONE Mini DisplayPort?

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All 3 have the same iMac (27-inch, Late 2009) - Technical Specifications

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Apple iMac 27" 

3.06GHz Intel Core 2 Duo, 

8GB 1067MHz DDR3 SDRAM - 4x2GB, 

1TB Serial ATA Drive, ATI Radeon HD 4670 256MB SDRAM, 8x double-layer SuperDrive.

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PS Note;

1)- iMac (27-inch, Late 2009) - Supports external display in dual display and mirroring modes. Mini DisplayPort also supports DVI, VGA, and dual-link DVI with optional adapters.

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2)- The 27-Inch models also accept "input from external DisplayPort sources" with an adapter, so it is possible to use these models as an external display for a DisplayPort-equipped Mac or Blu-ray player, for example.

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3)- Note that unlike earlier iMac models, the Mini DisplayPort on this system passes audio signals as well as video.

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4)- The System will be used for Office & internet only, NO film or photos editing or Gaming.

Many thanks