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(screen.info)Colon

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Enter node , (file) or (file)node

Colon
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   Customization can also be done online, with this command:

 - Command: colon
     (`C-a :')
     Allows you to enter `.screenrc' command lines.  Useful for
     on-the-fly modification of key bindings, specific window creation
     and changing settings.  Note that the `set' keyword no longer
     exists, as of version 3.3.  Change default settings with commands
     starting with `def'.  You might think of this as the `ex' command
     mode of `screen', with `copy' as its `vi' command mode (Note: Copy
     and Paste).