AWS Mainframe Modernization Service (Managed Runtime Environment experience) is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html).

# AWS Transform for mainframe Runtime concepts
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Understanding the basic concepts of the AWS Transform for mainframe Runtime can help you understand how your applications are modernized with automated refactoring.

**Topics**
+ [AWS Transform for mainframe Runtime high level architecture](ba-shared-architecture.md)
+ [AWS Transform for mainframe structure of a modernized application](ba-shared-structure.md)
+ [What are data simplifiers in AWS Transform for mainframe](ba-shared-data.md)
+ [AWS Transform for mainframe Blusam](ba-shared-blusam.md)
+ [AWS Transform for mainframe Blusam Administration Console](ba-shared-bac-userguide.md)