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I have 2 imac's i want to use a external displays with a ubuntu system. I've looked into vnc, but the lag is too much for use with video or visuals. any suggestions on an alternative software?

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Any network-based display system will include high amounts of lag. This is the nature of the differences between connections used internally to a computer and between it's various components and the connections used in networking: They are simply not the same thing, nor are they even comparable.

Are you wanting to use this like a KVM system, or a remote control, or as screens in addition to the one(s) already connected to the ubuntu box?

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as a screen in addition to the one connected –  user1048715 Nov 17 '11 at 23:47
i was looking at x11 but i cant find a way to use the program on more than one display. –  user1048715 Nov 17 '11 at 23:54

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