One purpose for this is to allow you to have your user folder stored on a network, letting you have different preferences for each Mac that accesses that home folder. The ByHost folder will gather a collection of plists for other preference panes, applications, etc., all with names containing the Ethernet ID specific to every Mac it's seen. These settings are at ~/Library » Preferences » ByHost » com., where 0011aa2233cc is the Ethernet ID of the Mac's primary Ethernet port ( en0), also known as the MAC (Media Access Control) address, which is a number unique to each Mac. The settings in the Desktop & Screen Saver System Preferences panel are among several that don't stick when you move an OS X startup drive to a Mac that you've never connected the drive to before.
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