To get [TclX] file functionality into the core it will be necessary to add -fileid option to file commands to allow an open file to be processed in place of the file name argument.  This may not be possible under windows.

The -keepalive option should be added to [fconfigure] for [socket]s

A new command [pipe] should be added to provide TclX pipe functionality.

'''Changes to tcl's file command'''

A new [file] type result, '''tty''', will be added.

    * file truncate for tclx's [ftruncate]
    * file lock for tclx's [flock]
    * file unlock for tclx's [funlock]
    * file dup for tclx's [dup]

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