a part of [stdio], this filehandle is opened by default for each application making use of the stdio package of code. 

This output file may correspond to a disk file, pipe, terminal device, or other construct. 

To refer to this output filehandle in Tcl, use the string '''stdout''' when using [puts] .
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Tcl 8.3 had a problem on stdout, when it was redirected to a file. The problem was that every buffer write caused a flush of the disk cache.  The workaround in 8.3 was to do (once, at beginning of script):
    fconfigure stdout -buffering full -buffersize 262144
so that there were few disk writes performed. (Thanks [KBK] and the [Tcl chatroom] for the quick answer! RS)

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[LV] anyone want to address the situation with stdio and 
[Windows]?  Are the file handles available by default?  What do you have
to do to see the output going to stdout?
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[Category Glossary] |
[Category Concept]