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Explanation of C Compiler for AIX

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http://www.unix.com – Hi, I have the following packages installed on my AIX server xlC.aix50.rte 10.1.0.2 COMMITTED XL C/C++ Runtime for AIX 5.3 xlC.cpp 9.0.0.0 COMMITTED C for AIX Preprocessor xlC.msg.en_US.cpp 9.0.0.0 COMMITTED C for AIX Preprocessor xlC.msg.en_US.rte 10.1.0.2 COMMITTED XL C/C++ Runtime xlC.rte 10.1.0.2 COMMITTED XL C/C++ Runtime Q1. Are the preprocessors actually a C compiler ? Q2. Are the above pre-processors some sort of cut down compiler, as I am wondering how this differs from the IBM compiler delivered via vacpp.cmp.tools ? Q3. What is the Runtime Environment ( RTE ) - how (HowTos)