Identify the Version of Mac OS on the Recovery Partition
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The Mac OS Recovery HD partition is a pretty handy troubleshooting tool that can also be used to reinstall or repair the Mac OS.
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Installing Mac OS Updates From the App Store
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What Apple's New Mac Repair Program Means for You
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Using the Mac's Recovery Disk Assistant
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Mac Recovery HD Volume: Reinstall OS X or Troubleshoot
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Minimum Requirements for OS X Mountain Lion (10.8)
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Managing the Resume Feature in the Mac OS
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How to Use the Mac's Auto-Save and Versions Feature
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Identify the Version of Mac OS on the Recovery Partition
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Installing Mac OS Updates From the App Store