Shared Data Partition + Lion + Snow Leopard - What files go where?

I have partitioned my new internal drive into 3 (which is currently in a enclosure).
The 1st Partition reserved for Lion
The 2nd for reserved Snow Leopard
And the 3rd reserved for a shared Data parition
I'm not enirely sure how to divde up the files. What should be put on the Data parition?
And how to direct each OS parition to access the shared data partition?
I would appreciate advice and example(s). Detailed information is always welcome.
Thank you.

darkhorse85 wrote:
It would excellent if you would could me about other programs such as Mail which would suffer releated issues.
I really don't know, and don't know if there's a list anywhere of Mac apps.  Mail seems to change with every release (and even some "point" updates).  I think Calendar is one, too.
This list of 3rd-party apps is unofficial, but seems pretty reliable as far as what will run where: http://roaringapps.com/apps:table
As you'll see, it's mostly geared towards Lion vs. Mountain Lion (and in a few months, will be Mountain Lion and Mavericks).
You'll probably have to use some trial-and-error, and/or contact the makers of the apps you use.
I am not familiar with using any kind of software as a Virtual Machine how would this work?
I'm not very familiar with it, but you install 3rd-party software that lets you run one OS within a different one, rather than having to boot into one or the other.  Basically, it puts a Virtual Machine folder containing one whole OS installation on the disk of another;  it runs concurrently with the other OS, in a separate window (or multiple windows for different apps, I think).  There are some downsides, especially performance, but a lot of folks do it, usually to run Windows, but some to run Snow Leopard on Lion or Mountain Lion.  There may be some restrictions on the Snow Leopard license, too -- Apple didn't allow that for OSX at all for a long time, except for the Server product.  I don't know what the rules are now.
Parallels and VMware are two I see mentioned often.  I seem to recall reading about a free one, but as it's pretty complex software, I'm a bit skeptical. 
I don't know where else to point you, but that should get you started on research.  Look for those apps and/or Virtualization Software to find more.
Good luck!

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