Presto Add-Ons allow you to work with non-traditional information sources, such as spreadsheet documents. Add-ons can also be destinations for mashups and apps, allowing users in your organization to work with these artifacts in applications or environments they are already comfortable with.
For an overview of these add-on components, see Presto
Add-Ons in the Introduction.
Presto Add-On for SharePoint: which allows you to work with
SharePoint lists and searches in
Presto mashups and apps. You can also import mashups or apps into native
SharePoint web parts to combine with existing web parts or wire together.