What is a file [handle]?  This is one of the various kinds of [Tcl handles] which is returned
by [Tcl] commands such as [open], [[add other commands here that return 
this type of thing - perhaps relating to sockets, channels, other?]]

They are a symbolic representation of an underlying operating system construct
that represents an open input or output file/device. Examples:

 set    handle  [open $filename w]
 puts  $handle  $line
 close $handle



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The Tcl man pages use the term [channel].

Unix calls the underlying construct a file descriptor.

[MHo] 2017-05-19: I noticed that file handles are "recycled", so if a specific handle is closed, short after that a newly opened file gets the same handle.


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