the import starts.

Delete imported pictures from source
If this option is active, pictures are deleted from their source after import.
Immediatly import new pictures
When this option is on, WIA-Loader watches the selected picture source. If a new picture
appears there, it will immediatly imported with the currently selected import profile.

Here you have several ways to select images for import. For example you can select only images from a certain day in the submenu 'Select by date'.