The function
make-stderr-stream
returns an output stream connected to stderr.
make-stderr-stream
returns the same stream each time. Calling close on this stream has no effect (except that it forces the output).
The console window will be created if it does not exist. That is not desirable for typical (non-console) applications. Therefore writing to the stderr stream is probably useful only in a console application (see the
:console
keyword argument in save-image), or when you know that stderr is going to be redirected.
make-stderr-stream
at runtime rather than in the build script, because it contains the handle of Windows stderr.LispWorks User Guide and Reference Manual - 21 Dec 2011