I have started intermixing c++ streams with old code and noticed that the USL
c++ class library violates the ansi c standard wich states that system include
files will use identifiers which start with __.

The case I am looking at is the fact that names such as endl, output, etc, should
really start with __. I have run into the problem where old code uses a function
called output, which clashes with the ouput variable declared with the streams.

The questions is, is the USL class library "system" files, or not ???