[slurgfest]

What happens to the X windows forwarded over ssh when the connection drops? Can you reattach afterwards?

[binarycrusader]

If you use something like Xpra, sure: http://xpra.org/

[wmf]

No, I think the app gets killed.

[donio]

Depends on the app. Emacs can survive and re-attach later. A single emacs session can be connected to multiple X (and tty) sessions at a time. I use this all day, my emacs session runs for weeks or months between restarts and I just connect/disconnect to X servers or ttys as needed.