iTunes Links changes the default action of the arrows in iTunes. Instead of sending you to the iTunes Music Store, you can change it to send you to all of that artist in your library.
You can combine a tag with another related tag by using the '+' link next
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3 Opinions:
...or you can open up a terminal and change it with "defaults write com.apple.iTunes invertStoreLinks -bool YES"
I believe if you hold alt then press the arrow it will do the same thing
This isn't very useful... Onyx will do this exact thing and is far more useful.