Gcc4 (now in updates) Questions

[David Cary Hart <Fedora TQMcube com>]

Now that gcc4 is in updates (and I am a C nitwit):

        GCC 3.4 was updated but remains on the system, correct?
        
        Do I now have to make a GCC choice when building a package or
        compiling an RPM?
        
        Can I assume that some things will compile with gcc4 and some
        won't?
        
        If that's correct, can I further assume that, what will compile
        with gcc4, should be compiled with gcc4?
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