When you position the mouse over a type, method, field etc., a tooltip will pop-up showing information on corresponding declaration.
Some examples are presented below. In a similar way you'll see information on fields, events, variables etc., predefined or not.
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Type Info |
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Macro Info |
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Task Info |
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The information presented in the tooltip is created using the comment on top of the declaration.
For example, given the following declaration of a field:

the corresponding tooltip will look like this:
