Notifications on windows

I’m writing an alarm clock program, and right now
You have to be looking at the program to see the alarm. I would like to be able to make my program to display a notification when the alarm goes off, like the built in alarm in Windows.

I read a while ago that you need to register your app as a service in window. This will require to place the executable in certain folder and register it with Windows service manager (?). I suggest you do a little research over the net. If you find something interesting, share with the community. I hope this helps and good luck!