Notifications in elgg

Hello,

I am new to Elgg. Can someone tell me how notifications system work ? When I subscribe to an email notification for a group (ex in https://elgg.org/notifications/group). Wich events are declared as a notification and when are they sent to me by email ? Is there a way to force notification  sending? Should I have to configure a cron to enable notifications ?

Thanks for your help

 

Beginning Developers

Beginning Developers

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