There are different ways to start the TN3270 emulator specified in the IDE options: 
                  		
               
 
               		
                
                  		  
                  - From Solution Explorer - right-click the project in Solution Explorer, and click 
                     			 Enterprise Server > Mainframe TN3270 Display. 
                     		  
                  
  
                  		
               
 
               		
                
                  		  
                  - From Server Explorer - right-click the 
                     			 enterprise server region associated with your project, and click 
                     			 Mainframe TN3270 Display. 
                     		  
                  
  
                  		
               
 
               		
                
                  		  
                  - Start running the application - click 
                     			 Debug > Start Without Debugging. This launches the TN3270 emulator for the StartUp project in your solution. 
                     		  
                  
  
                  		
               
 
               		
               Note: If you use 
                  		  Rumba+ Desktop, you receive a notification that it creates a read-only temporary profile that does not save any changes when you open or
                  close the emulator.