Identifies the default output destination provided to OmniMark by the system.
In earlier releases of OmniMark,
#process-output was called
#console, and this keyword can still be used to perform the same function. The use of
#console is deprecated.
The "declare #process-output has" declarations can be used to change some of the characteristics of the
#process-output stream. Note that
#process-output never allows referents, so to declare that this stream has
referents-not-allowed is an error.