Impex help page
 

At the moment and in the latest version (1.96) Impex proposes a basic content migration (basic bulk import) from different systems like drupal, joomla and wordpress.
When one wants to reverse the impex process (delete imported datas, contentids, etc..), there is a "database revert and restart" link at the top of impex page that does nothing with imported CMS content.
This file help.php is still the one used for forum import.
I think an update of this file would be great so that we can make successive test import without loading the database with duplicate content.