calculus of PT_NOTE "for GNU/Linux 2.6.32"

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Executable program files built by gcc+glibc on Fedora 14 contain a PT_NOTE
which says "for GNU/Linux 2.6.32".  (For example, see "file /bin/date";
the presence of a NOTE is indicated by "readelf --segments /bin/date",
but readelf does not display the contents.)  What does the PT_NOTE mean;
what program cares about this value?

The /bin/date of Fedora 14 does run on Fedora 11 which is only Linux 2.6.30.
So there is no harm in this case, despite "not meeting the requirement."  Why?
If the requirement really is something less than Linux 2.6.32,
then why not note the minimum kernel version that is required?
How far back on previous Fedora releases can the /bin/date (and/or anything
else built by gcc+glibc on Fedora 14) run successfully?  What does this mean
for builders who want to build on Fedora 14 and distribute the binary
executable program files to run on other systems?

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