What is an Intel PXE ROM?

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Where do I find out more information about the "Intel PXE ROM"?

Every now and then I get a boot error referring to an "Intel PXE ROM". The
error always goes away upon the next boot so the boot problem isn't what
I'm asking here. I just want to know what this "Intel PXE ROM" is.

I googled for "What is Intel PXE ROM" and found many people had problems
with this 'thing' but I did not find an explanation of what it actually is.

Do you know what an Intel PXE ROM is? What does it do?

If it matters, here is the boot error I get every once in a while on my
Thinkpad laptop running Windows XP Service Pack 2 (the message isn't the
question though).

Do you know where I find out more about what a "PXE ROM" is?
Intel(R) Boot Agent Version 4.0.22
Copyright (C) 1997-2001, Intel Corporation
Intel Base-Code, PXE-2.1 (build 083)
Copyright (C) 1997-2001, Intel Corporation
CLIENT MAC ADDR: (long number)  GUID: (long number)
PXE-E53: No boot filename received
PXE-M0F: Exiting Intel PXE ROM
Operating System not found
(Again, the question isn't about the error because it goes away when I
reboot. The question is where can I find out what an Intel PXE ROM is?

Thank you,

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