How does pacman know how to remove packages?

I've been looking at the 'Creating Packages' page, and it says to create a pkgbuild I only need to specify the build function. My question is... how does pacman know which files to remove when you do pacman -R? Does it keep track of all the files that were installed via build()?
Second question: How do you guys keep track of packages that weren't installed via the AUR? For example, if you want to hack on a project and use that hacked copy instead of the one available in the repos, what do you usually do? I'm guessing that I should let pacman keep track of those by creating pkgbuilds for them, naming them something like [packagename]-[version]-myown, and noting that it conflicts with the package in the Arch repos... is this correct?

When you build a package with makepkg, the build function is responsible for installing the files that will be contained in the package under ${BUILD_DIR}/pkg. That directory will be tar'ed and compacted to make your final package. When you install it with pacman, will be created the file /var/lib/pacman/local/<name of your package>/files which will list all the files owned by your package. So pacman can know how to remove them when you ask it to be deleted.
About your 2nd. question, you are quite right. The only correction is that the name of your new package should be something like "package-myown-version". You should put the old name in the conflicts and provides directive of the PKGBUILD. You should read the wiki about ABS. With it, you can get a copy of all PKGBUILDS for your current repositories, so you can change what pleases you more.

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i take a package from pacman cache on box 1
i rename it from say xorg-1.4.0.pkg.tar.gz to xorg14-1.4.0.pkg.tar.gz
i pacman -U it on box 2
pacman on box 2 : upgrading xorg ###############33
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several reasons
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http://support.microsoft.com/mats/Program_Install_and_Uninstall
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To change asccount information see:
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For the code issue this may help.
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P.S Click the image below to show its real resolution!
Regards,
A.G
======================================
www.audiogrocery.com
Author of: Logic GUI Deluxe(Free), Vox De Bulgaria s.a.g.e vocal pack for RMX, Logic Snapshot Console, RMX Power CTRL - Logic Environment Midi editor for Stylus etc.
======================================

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Mac OS X Snow Leopard and malware detection
OS X Lion- Protect your Mac from malware
OS X Mountain Lion- Protect your Mac from malware
OS X Mavericks- Protect your Mac from malware
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How does pacman know how to remove packages?

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