There are two forms of the #include directive. Both forms have the effect of reading in a file and replacing the #include directive with the contents of the file (presumably C source code). The difference between the two is the way in which they search for the file whose contents you want to include.
#include "file"
begins searching for the desired file in the catalog that contains the original source file. If the inclusion file is not found under this catalog, C continues its search under the catalog
C_G8_NS/8CV1.3/INCLUDE
This catalog contains a number of standard "inclusion files" that are part of the multi-segment C software package.
When the form of the #include directive is
#include <file>
C does not bother searching the catalog that contained the original source file. Instead, it goes directly to C_G8_NS/8CV1.3/INCLUDE. This is the usual way to obtain a standard inclusion file, e.g.
#include <stdio.h>
If it ever becomes necessary for you to examine the contents of a standard #include file (e.g. to find out the actual value of a manifest symbol), simply read the appropriate file. For example, if you want to examine <stdio.h>, look at
c_g8_ns/8cv1.3/include/stdio.h
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