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Section 6 - Low Level Library Subprograms
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This section is designed to give the user a working knowledge of
the low level functions and subroutines.  This information
is supplied for informative purposes only, since the user should
not invoke these routines directly under normal circumstances;
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appropriate routines in sections two or four should be invoked instead.
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Each routine has its own entry organized under the following headings.
Note that empty entries are omitted entirely.
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Header Line
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The subprogram's name, a synopsis of its purpose, and the date
of last modification to its documentation.
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Calling Information
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The subprogram declaration and the declarations of its
arguments, as well as the name of the library in which
it can be found.
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Function
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A description of the purpose of the routine, along with
the interpretations of its arguments and the returned value (if any).
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Implementation
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A short discussion of the strategy used to implement the routine,
abstracted from the source code.
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Arguments Modified
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Names of those arguments modified by the routine.
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Calls
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Other subprograms called by this routine.
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Bugs
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Known problems with the use of the routine.
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See Also
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References to further information or related routines.
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