title: Push notifications with SignalR
body: <p>I am developing an application in .net core with SignalR. Users will be subscribed to the system. What I need to know is: Does a user have to be logged in to receive a notification? I would like for the notification to be pushed without them having to log in every time. It must be similar to a WhatsApp message that just "arrives". Is this possible with SignalR?</p>