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I know that it is possible to forward the windows of an X-windows-system application to a client's desktop via SSH when you start the application in a SSH terminal session which has X-forwarding enabled.

But is there a way to forward the windows of an application which is already running on a remote system? Most impressive would be a way to keep a windowed application running on a headless server system, so that when I ever need that application I can forward its windows on-demand to my desktop system, without the need to ever stop this application or the application being closed down because my SSH connection times out.

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NX is capable of keeping sessions alive.

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I will look into this. Thanks. – aef Feb 20 '11 at 0:18
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Vnc does this (on Linux the normal Vnc servers create a virtual display rather than sharing your desktop like in Windows), but you would need to have run the application in the Vnc server up front.

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I know, but this way you have to forward a full desktop as far as I know. That's not what I'm looking for. – aef Feb 20 '11 at 0:17
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Try xpra. It's basically screen for X.

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