Patches, caches and such

[Mulder]

Hi all.

My ps3 isn't connected to the internet so I don't know these things. If someone could answer these questions for me I'd appreciate it! (Can't find much info on other forums)

1. How do you download a patch or a demo for a ps3 game?
2. Where does the patch and/or demo save to on the ps3?
3. How do I delete this patch and/or demo if I don't want it anymore?
4. Where is game and internet cache saved to and how do I delete this?
5. Is there anything else which gets saved to the ps3 without me knowing while playing a game or surfing the net and if so, how do I delete it?

Thanks for the help!