This is the default tab that appears inActionswindow when theActions..button is clicked in the main screen. Design elements (i.e. views, forms) are shown side-by-side in columns, with each cell being occupied by an action. The first column is reserved for shared actions.
In this tab you can directly apply actions to several design elements all at once. With actionBarEZ you can move, copy, paste, edit, delete columns: Manage all of your actions in a single table.