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From the command-line, if the "&" is placed after the command (as above), the shell will not "hang" and you can continue to do work in it. Otherwise, you will have to wait for the application to finish. This can useful, because using the Ctrl-C escape sequence will kill the application, which can be useful if it hangs.
Other example X programs that come with XFree86.
| No Format |
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xmag
oclock
bitmap
xcalc
xeyes
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Using X from Remote Clients with SSH
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