What would happen if I used Recovery Disk?

I've recently bought a new iMac (Core i5) that came with Lion pre-installed, but I needed Snow Leopard for all my older software e.g. Photoshop CS, so I got the sellers to install SL for me. Everything is fine.
Out of curiosity I tried to see if I could run Tiger from my old G5 HDD which is connected via USB, but it didn't come up in the list when I did Restart + Option. However, what DID come up was an extra drive named "Recovery". I understand this is a separate Lion partition on my HDD - so, what would happen if I selected that via Restart + Option? Would it open Lion on my iMac so I could have a play around with it? And if it did, would I then be able to get back to SL and all my data, users, and settings, after I'd finished?
I don't want to try it out without advice, in case Lion overwrites SL irretrievably.

christopher rugby wrote:
My question is this : can I safely restart from Recovery in order to just play around with Lion, or will starting from Recovery reinstall Lion over the top of SL on my main disk?
If your machine only has SL and the Recovery HD, then the only thing you can do when booting into the latter is REINSTALL Lion on top of SL or do some basic things, but Lion isn't installed. Details in Recovery/ and About Lion Recovery.

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