# Asynchronous Message Transfer

Use the asynchronous message transfer method to immediately and very quickly transfer messages by way of Substation ES and Mainframe RED XCF List facility to other applications or external services within the reach of ESB.

Use the asynchronous message transfer method for medium to high volume real-time messaging.

Also, consider using the asynchronous message transfer method in the following scenarios:

- When applications frequently send messages or send messages within a transactional context that are required to be committed or rolled back depending upon the transaction execution status.
- When the CICS and IMS BMP transactions publish messages and events very frequently.

User applications send messages using SXXTRED which can either relay or receive transaction information. Substation ES still uses the EXCI protocol for administrative functions and status updates, so all user related information is transferred using the XCF List facility.

The following figure shows the message architecture of asynchronous message transfer services:

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