Home on its own partition

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http://askubuntu.com – I have installed 11.10 and looking to do in place upgrade to 12.04 LTS. I think I partitioned it such that home is its own partition so an upgrade could leave it insulated. I have some questions a) How do I confirm that home is its own partition. Something I look for in df command? I get all discombobulated with the /sda1 and /sdb2 and so on. b) Can I install another linux and share the same home partition with it? c) Are my software applications installed in the home partition so I don't potentially compromise them when I upgrade? Thanks! (HowTos)