The application chooser is a dialog (see figure 3.4 that will appear when you click the "Choose..." button in the key settings part or one of the "Choose..." buttons in the preferences part. The dialog contains a categorized list of the applications on your system. When you select an application from the list then the command of the application will be visible in the "Application command" text box. This text box allows you to modify the command that you want to use. Click the "OK" button to choose the selected application or click the "Cancel" button if you do not want to change the application.
The application chooser
The application chooser.