You can run prerecorded macro files in the embedded Rumba mainframe display as follows:
in the toolbar of the embedded Rumba mainframe display window and select the macro to run.
It is not possible to use to create Rumba macros in the embedded mainframe display.
For more information about using the 3270 keys, PF keys, PA keys, and on how to record a macro, refer to the Rumba Help.