Using MacOS X 10.6, is there a way to "switch users" in a window? I'm looking for something like xnest.

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Could you explain for what you need this? Maybe there are alternatives to running another user on the same system in a window. – Daniel Beck Oct 7 '10 at 16:13
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2 Answers

No.

You can run single applications as another user using sudo -u shortname /path/to/Application.app/Contents/MacOS/binaryname (note that it requires the executable, not the application bundle! open fails to start applications as a different user).

A GUI way to do this might be Pseudo, but I haven't tested it since a few years ago

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To open an application from the terminal without digging around inside the bundle for the binary, use the open command i.e. sudo -u shortname open /path/to/Application.app – Scott Oct 8 '10 at 11:42
@Scott: Try it. It will fail, as I wrote in my answer. You really need to launch the binary directly, which is always in Contents/MacOS/ and most of the time the only file there. So C, [tab], M, [tab], [tab] will get you there 99% of the time. – Daniel Beck Oct 8 '10 at 19:01
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You can also use Fast User Switching to run an application as another user with that user's preferences and data.

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