How 32-bit binaries are told to access the proper multilibs (lib32-*)

Hello,
I'm curious -- how is Arch prepared/configured to automatically direct a closed/static binary to the appropriate 32-bit library in an x86_64 system?  I would guess there are some automatic changes when a 32-bit binary is invoked.  Maybe some temporary binds are put in place, but where is this defined and how does it work?  Perhaps we can use some content and discussion in this thread to spruce up the related wiki page:  https://wiki.archlinux.org/index.php/Multilib_Project [+]
Background and some related reading I was looking through:
https://wiki.archlinux.org/index.php/Ar … _Arch64.3F [+]
https://wiki.archlinux.org/index.php/Ar … nvironment [+]
-velu

Just dumping additional related material for review.  Feel free to dump more!  Trying to learn here, but have no mentor or reliable sources.  Possibly generate some interest in other newbies.
(This is all just unverified stuff, not strictly compatible with how 32-bit has been prepared on 64-bit Arch.)
basics
http://en.wikipedia.org/wiki/X86-64#Linux [+]
example on a debian system
http://www.debian-administration.org/ar … _GNU/Linux [+]
gentoo's chroot guide
http://www.gentoo.org/proj/en/base/amd6 … t=1&chap=2 [+]
arch's chroot info, no directly related to linking libs
https://wiki.archlinux.org/index.php/Chroot [+]
general info on libraries, nothing about switching between long-mode and 32-bit
http://tldp.org/HOWTO/Program-Library-H … aries.html [+]
and of course man ldconfig, ldd, ld.so, and elf

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