If Rumba+ Desktop is your TN3270 emulator of choice the IDE launches it, if it is not already running, and starts the application in it in a mainframe session.
If you receive a message that the Rumba profile will be read-only, click OK. The session then connects automatically.
Stopping debugging in Visual Studio closes Rumba+ Desktop automatically. Closing Rumba+ Desktop stops debugging in Visual Studio and the mainframe session ends.
If Rumba+ Desktop is already open when you start debugging, Visual Studio enters debug mode and you can step through the code. Stopping debugging does not close Rumba+ Desktop. You can manually connect Rumba+ Desktop to the server to load and run the application.