+Some hooks expect "magic" values to be replaced. Often they are
+intuitive, but sometimes it is easy to forget. For example, the
+finalize hook should return true (default) to indicate the step is
+complete and false to indicate that it failed and the page should be
+redisplayed. You can import a set of constants that allows for human
+readible names.
+
+ use CGI::Ex::App qw(:App__finalize);
+ OR
+ use MyAppPkg qw(:App__finalize); # if it is a subclass of CGI::Ex::App
+
+This would import the following constants:
+App__finalize__failed_and_show_page (0),
+App__finalize__finished_and_move_to_next_step => (1 - default), and
+App__finalize__finished_but_show_page ("" - still false). These
+constants are provided by CGI::Ex::App::Constants which also contains
+more options for usage.
+