Hellow there, Gnu Java Compilers all!

I have had the GCJ java compiler happily running on windows xp sp3 mingw 32 bit.

I have upgraded to a quad core windows 7 64 bit pc.

I have also learned that there is a 64 bit mingw that also supports

GCJ compiling to both 64 and 32 bit files.

-Does this 32/64 version of mingw come with its own special version
of the Gnu compiler for 32 and 64 bit compiling?

-Does it automatically support 32 and 64 bit compiling for the ordinary
gcc-4.6.0.tar.bz2 [GCJ], or does it come bundles with its own
specialy version of GCJ?

**Is there a automatic install and setup file, like
mingw-get-inst.exe is for 32 bits?  Can I have a URL
link to such a setup file, being for a 32/64 bit version?**