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Concept
Label is a tool that lets you label your files, giving them an extra label-attribute and their icons a color-tint. This makes it easier for you to spot them, and also allows you to query for files of a certain label.

Installation
Put the file called "Label-L" in this folder:
/boot/home/config/add-ons/Tracker.
(There is a link to it conveniently placed in your New folder.)

How to use it
Select a file in Tracker, press Alt-Option-L, choose a label from the popup menu or check out the settings window.