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I am a web developer. I am running on osx lion. A coworker, who runs snow leopard, found a bug in a feature that implemented that occurs only on his version of safari. The bug does not occur in mine.

I want to debug the issue on his computer without kicking him off his computer every 2 minutes when I make a change to my code. Is there a way that I can set up an account on his computer and remotely connect to it without interfering with any work he's doing?

I need GUI control, while at the same time not taking GUI control from him. THIS MEANS NO VNC. I also would like a free solution if one exists. I've been googling for a while now, but i feel like i am not hitting the correct search terms.

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I don't think this is possible if your coworker's on Snow Leopard, because native multi-user screensharing was only added in Lion:… – Nick Sep 20 '12 at 14:43
i am not looking for screensharing. What i am looking for is to log into a user account he created for me remotely, and have access to the gui, without interfering with what he is doing. – aamiri Sep 20 '12 at 15:46
I think screensharing is what you want, but unfortunately the "share the screen of a separate user account on a remote machine without affecting the currently logged in user" feature is only available in Lion. From the article I linked to: "In Mac OS X 10.7 Lion, the built-in Screen Sharing feature, updated from 1.1.1 to version 1.3, now allows remote users to log into a separate user account from the one that is currently logged in. That means that while one user is logged into a machine, a second user can login to the same machine remotely, seeing their own desktop and user environment." – Nick Sep 20 '12 at 15:51

I'm not sure if this could work but, as you're stick on this, you may try access your coworker's Mac through SSH and try using the open command (see the man pages for the opportune arguments).

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