There are some articles about the IO subsystem of Tcl at SourceForge [http://sourceforge.net/docman/?group_id=10894]. Unfortunately one of the articles encounters a size limit imposed by SF. The text version of this article is now here on the Wiki:

   * [Tcl IO Drivers] aka ''The Tcl I/O system as seen by a driver (channel type)'' [http://sourceforge.net/docman/display_doc.php?docid=1791&group_id=10894]
   * ''The interaction between the I/O subsystem and the [notifier]'' [http://sourceforge.net/docman/display_doc.php?docid=6710&group_id=10894].

The second article is not truncated. It might still make sense to put it here nevertheless, to have everything together.

For examples see [Channel Implementations].

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