These subdirectories contain operating-system dependent routines.  All of the
servers in this release use the 4.2bsd code to drive the networking, although
two of them also use the sysV code to emulate various bsd utility routines.

One thing that we have learned over the last releases is that having multiple
copies of similar routines causes substantial troubles.  It is far better to
work at building a common base than to replicate intricate code.
