Integrating appwrite realtime feature

i want to use the appwrite realtime feature for the context of commenting and messaging

As of now, you can use Appwrite real-time only from one side server->client

PLease explain better, much interesting with examples

Appwrite realtime will broadcast events to all subscribers through change-channel
So, for example, you can initialize a subscriber in your app to listen to a collection/document channel.
Then, all changes/deletions/additions to the collection events will be broadcast through that channel.

In messaging example
You can add documents to each collection. This most be done through API, then the change will be broadcast in realtime