Where can I find a list of what different keys do during startup?

After recently installing Lion on my MacBook Pro I found many of my apps wouldn't work. I called Apple and they helped me to uninstall Lion. They had me hold down C + R during startup and another time "Option" key. Fairly new to Mac but would like to know my different options. Is there a list somewhere that explains what holding different keys during startup will do?

http://support.apple.com/kb/ht1343

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