What are $AddOnsDirectory and $UserAddOnsDirectory?
 Application packages that are not part of a standard Mathematica 4.2 distribution are installed by default into the location specified by $AddOnsDirectory. Application packages installed in this location will be accessible to all users. Application packages intended for one particular user should be installed in the user-specific location specified by $UserAddOnsDirectory. To see the exact location of these directories on your machine, evaluate the command $AddOnsDirectory or $UserAddOnsDirectory in a notebook. For additional information on installing and using application packages, open Mathematica the Help Browser and navigate to Add-ons → Working With Add-ons. Download this FAQ as a Mathematica 5.2 Notebook
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