Structure Diagram for FIO: Event I/O Support
                 ============================================
 
         An Introduction to the Structure Diagrams is available.
        NB  These links will be broken until the HTML Version of the Code is installed.
 
 
Introduction
------------
 
FIO takes a set of FILE commands and records them in an internal data structure.
Other sofware units (SUs) may then query this structure to see what files have
been associated to them.  FIO will use default files names located in the JOB
bank, but ONLY of the user has not issued ANY FILE command for that SU.  For
more detail, see the Programmer's Manual.
 
 
Titles Banks Used
-----------------
 
 JOB  Job control (for default file names)

 
 
Initialisation Routines
-----------------------
 
FIO is initialised with:-

FIO_INI

After this, none or more FILE commands can be passed using:-

FIO_PARSE

After all FILE commands have been processed, defaults are established with:-

FIO_SET_DEFAULTS

Finally, a summary of the active FILE commands can be obtained with:-

FIO_SUMMARY
 

Execution Routines
------------------
 
The main query routine is:-

FIO_QUERY

Some of the chores involved in processing options can by-passed using:-

FIO_OPTION_VALUE
 
 
Termination Routines
--------------------
 
None.