New 27" Quad Core I5 or I7 and 64 bit Applications

I may be purchasing one at some point in the not too distant future and was wondering how exactly does the new iMacs and 10.6 work with 64 bit applications? I'm really in the dark about this, so I'm sure this sounds like a dumb question.
I run the usual Adobe apps but I also have a 3D app (Cinema 4D) that would greatly benefit from running in 64 bit. Is that something you have to switch on and off? How would you use 64 bit apps with 32 bit apps?
Thanks. Again, sorry if this is basic.
Bob

Performance; the i7 shows as measurably faster than the i5. Take a look at the benchmarks at the following sites:
http://www.barefeats.com/
http://gizmodo.com/5407204/benchmarked-the-quad+core-i7-imac-is-super-fast
Regards.

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