Toobox is a collection of tools. Each tool is in the form of bundle. In a
given category, you can add new items. Each item contains the values of location
and of bundle (tool). Depending on the location, items can have different contents
even with the same bundle. Conceptually, it is similar to the bookmark. It does
not only store the location, but also the tool to access the location.
The item is not supposed to change its location frequently. It is designed to access the fixed location, either on file system or over internet. Some items don't access any location, such as calculator.
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