**** The variable coding-system-for-write, if non-nil, specifies the<BR>
coding system to use for writing a file, or for output to a synchronous
subprocess.
<P>
It also applies to any asynchronous subprocess or network connection,
but in a different way: the value of coding-system-for-write when you
start the subprocess or connection affects that subprocess or
connection permanently or until overridden.
<P>
The variable coding-system-for-write takes precedence over
file-coding-system-alist, process-coding-system-alist and
network-coding-system-alist, and all other methods of specifying a
coding system for output.  But most of the time this variable is nil.
It exists so that Lisp programs can bind it to a specific coding
system for one operation at a time.
<P>