Lotus Notes and GTD Projects - Why a Databse

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Project Support Materials
On page 161 David suggest using a Lotus Notes database for projects. I know how to create a database, but what would I store in this Notes database ? Would I store emails, reference material, etc ?

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I know how to create a database, but what would I store in this Notes database ? Would I store emails, reference material, etc ?

On the same page David wrote: You may also find it worthwhile, if you don't have one already, to set up a more rigorous kind of digital database for organizing your thinking on a project or topic.