You can set which app helpers to use in your controller by declaring it on your app/application_controller.php
class ApplicationController extends AkActionController {
var $app_helpers = 'my_global';
}
You could also implement you helper as a plugin approach. To see an example try
./script/plugin install calendar_helper
the plugin is at app/vendors/plugins/acts_a_calendar/. Important bits are the init.php and the helper itself in the lib folder.
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