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I'm not exactly sure what you mean, but I think you're asking if you install Windows 7 on your Mac's hard drive, if you can still boot into Mac OS X.

If that's it, yes.
 
Sorry I should have put boot off windows from an external hard drive rather than installing windows by using bootcamp
 
You can only boot off of windows from a CD (install CD/DVD) or from an internal connection (internal HDD).

Well that sucks. I don't wanna use bootcamp because then i will always be asked to choose an OS everytime I start up
 
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