PXE vs imaging partition

I'm just trying to figure out ZDM imaging and the documetation has left me somewhat confused.

Initially, I got an impression that the "image safe data" is kept in a special ZENworks
imaging partition on the HD, so when the workstation gets re-imaged, the ZENworks imaging agent
restores it's original networking settings (TCP/IP config, NETBIOS name and workgroup etc.) from
there.

Then I read some more and found it stated quite emphatically that "You don't need the ZENworks
imaging partition when you're using PXE."

I am using PXE.

So, where is the image safe data kept in this case? How is this information restored when
the workstation gets re-imaged?