These applications will not have access to UNIX services or be able to
communicate directly with UNIX processes. This is because there are no
libraries for the UNIX calls available under the Macintosh OS in MPW or any
other development system that we are aware of.
Under A/UX, libraries do exist, as do the necessary Macintosh libraries for
writing Macintosh-style programs that perform UNIX functions and system
calls. However, there is no support for object-oriented programming
similar to MacAPP. The C compiler available with the system is a standard C
compiler without any object-oriented extensions.