[syslinux] questions about pxelinux.

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I google that pxelinux is a NBP, and i have there questions after glancing the source code, exactly  pxelinux.asm.


1     should NBP specify target processor mode to 16? but also found 'BITS 32'in the pxelinux.asm.
2     should pxelinux.asm assemble into a raw binary file? but found '$(NASM) -f elf' in MAKEFILE under ./core/ dir.
3     can be used to boot window OS?


thanks for any response.