Magento Admin Order's Status Notification

Why all Magento store's onwers should own an Admin Order's Status Notification extension?
OK
Wed, 1 Jan, 2014 at 3:18 PM
What is the singleton running application?
The singleton running application is application that allows only one instance of application can be runned at the same time on the same pc. Example: ...
Thu, 2 Jan, 2014 at 10:49 AM