How openSUSE choose system default font?

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http://forums.opensuse.org – Hi, I'm using openSUSE 11.3 Ever since I started using Linux, I have had problems with Korean fonts. Now I think I am close to the solution. I want to know how openSUSE decide which fonts to use as the system default fonts. I know that I can change them in the Appearance -> Font dialog. But my questios is if those settings were just set as Sans (the default), how openSUSE choose what is Sans? I'm asking this because I found that if I copy Arial and consolas fonts into my ~/.fonts folder, then openSUSE uses them as the system defaults fonts. I don't kn (Distributions)