What can ONLY be done with VM connectors, and NOT with Flow References?

The ability of VM connectors to allow a flow to pass events to another flow asynchronously is a distinct feature that sets them apart from Flow References. When using VM connectors, the calling flow sends an event into a VM queue, allowing the processing of that event to happen independently of the original flow's execution. This decouples the two flows, meaning that the calling flow does not have to wait for a response before it can continue executing subsequent steps.

In contrast, Flow References typically invoke another flow synchronously, meaning that the original flow will wait until the invoked flow has completed its processing before it can proceed. This synchronous behavior limits flexibility in scenarios where parallel processing is desired.

As a result, the asynchronous capabilities of VM connectors provide more robust options for managing event flow across multiple processes, enabling greater scalability and responsiveness in application design.