Possible to run different versions of OSX on same internal HD in iMac?

Hi All,
I am a Pro Tools user, and Pro Tools is usually many weeks/months behind in supporting the latest builds of OSX. So while the rest of my computing needs would benefit from immediate upgrade when the newest OSX build is out (i.e. better network performance, security enhancements, etc.) I'm often warned by Digidesign not to upgrade until they've certified Pro Tools works with the newest build.
So I want to buy an iMac with a large hard drive, and I'm wondering if this is possible: can I partition that hard drive and run 2 versions of OSX on it? Initially they'll be the same build (10.5.5 or .6 whichever it comes with) but on one partition will be all of my programs minus Pro Tools, the other one will only have Pro Tools. I'll upgrade one partition regularly to the newest version, but keep the other partition to the last approved OSX build by Digidesign.
Is such a thing possible? How would I choose to boot from the other partition, by holding ALT at startup just like I do when I want to boot from an external firewire HD? Would I have to buy a second license of OSX?
Thanks!

A new mac, that came with leopard won't be able to boot to 10.4.11. You will be able to view the files on the external, but many programs when opened, e.g. address book, will say that they are not supported on this architecture.
ADW wrote:
(including Classic OS 9)
If this is a separate partition that has an install of OS 9, you will not be able to boot from it. Again, you will be able to view files and even fewer (if any) files will be supported. If you have used an app like monoligual to remove old architecture support then you definitely won't be able to run the apps.
I have little experience with OS 9.
If OS 9 is not on a separate partition then I am not quite sure what you mean.
Regards

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