What can and what can't be placed remotely?
How is this generally done, if it is done?

For example, I may want /boot to be in my local box, while /usr and /home is on the network somewhere.


Also, must all distros be the same in such a setup?

What I'd also really like to know is if it's possible to have a portable /home/(user) on a usb-key/hd? Once the key is installed, the user has access to their local home only as a copying mechanism, which may make a key-home copy of their home to their local home folder and vice versa.
For example, the local home folder is writeable if and only if the portable home is not installed, other wise the local home folder is a copy from, copy to usb-key/hd home folder.

thank you

You can make a system completely network bootable. If you can boot from your ethernet card (i.e your mobo supports this feature) you can have a completely diskless system.

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