[gentoo] installation

[m.w.chang]

glancing the installation guide:

1. must the internet be accessible when installing gentoo?
2. what are "Portage Tree" and "GRP"?
3. where does the `emerge` command get her source files? the cdrom?
4. can I use my own kernel source (say a direct download from
    kernel.org plus xfs patch for 2.4.20) instead of the one bndled
    on the liveCd (ie, xfs-sources)?
5. if I choose to expand the Stage-3 tbz2 from the LiveCD,
    does it mean I could skip stage 1 and stage 2 altoghter?

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