Fences is a utility designed to reduce the clutter by organizing your desktop icons. When you install Fences, the Setup program asks you if you want to create your own fences or if you want Fences to build some fences of its own. If you choose to let the software create its own fences, your icons will be organized in a more meaningful way. Of course you can always create additional fences, or modify or delete any of the default fences.
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