Hi Milad,

Yes, I confirm that if you subscribe an item with multiple subscription your client will receive the updates multiple times.
So, unless you want updates with different frequencies or to have the opportunity to unsubscribe at different times, it is better to have a single subscription.

Please also note that you can add as a subscription listener two or more grids (StaticGrid or DynaGrid).
In this way, a single update event received by the JavaScript library will be displayed in two different points automatically.

Regards,
Giuseppe