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 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. You can manually connect Rumba to the server to load and run the application.