The core [Tcl] '''fconfigure''' [command] sets and retrieves options for [channel]s. 

***USAGE***
    :   '''fconfigure''' ''channelId''
    :   '''fconfigure''' ''channelId name''
    :   '''fconfigure''' ''channelId name value'' ?''name value ...''?

***MAN PAGE***
http://www.tcl.tk/man/tcl8.5/TclCmd/fconfigure.htm
 
***SEE ALSO***
[channel], [open], [socket]

***EXAMPLES***
Instruct Tcl to always send output to stdout immediately, whether or not it is to a terminal:
======
 fconfigure stdout -buffering none
======
Instruct Tcl to read pure bytes from a channel and write bytes to it, rather than characters:
======
  fconfigure $binaryDataFile -translation binary
======

<<discussion>>
[LV] 2008 Feb 28

Some of the wiki pages talk about the construct

===
fconfigure $serial_port -mode "$baudRate,$plex,$bits,$polarity"
===
or some such thing. The -mode flag, used for specifying baud rate, etc.
has moved to [open] now. I don't know how one would change those values on an open descriptor...

<<discussion>>

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