Push notifications are notifications that appear on your smartphone without opening the app. As a prerequisite, the app must run in the background and an Internet connection must exist.
Activating this will cause the server to be registered at i-net software's relay server for sending push notifications to devices running i-net apps. Push notifications are sent with SSL-encryption and are only sent to devices whose users have chosen to receive them.
Your server must be able to reach push.inetsoftware.de in order to activate push notifications.