Can different entities in sharded cluster communicate with each other?

The materials on Cluster Sharding imply sending messages from outside the cluster to entities in the cluster. However, can entities (actors) in different sharding regions/shards of the same cluster communicate between each other? Is there some sample code for this? (on how we send a message from one entity to another within a cluster)

This looks like a cross-post from

Yes, the question can be closed as addressed neatly at stackoverflow, thank you!