AWS Blu Insights Terminals application brings its own TN3270, and TN5250 terminals that can easily be connected to mainframe or AS400 environments. These terminals allow browsing applications that propose a screen-based interaction (green screens) similar to other terminals. In addition, they record all user interactions. The outputs are a video of all the workflow, a json file with all the actions performed by the user and a Selenium file. These outputs are the test scenario artifacts to be used to validate the modernized application.
In a modernization context, this feature allows to reduce the cost of test scenarios capture and replay since it is reduced to a simple use of the application on the legacy environment.
More details about the feature can be found in the documentation.