Start the module for background processes or the module for the UI

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Import the net.rim.blackberry.api.messagelist.ApplicationMessageFolderRegistry class.
Create a main method for the BlackBerry®device application.
```
public static void main( String[] args )
{
try {
```
In the main() method, check if the value of the args parameter indicates that the BlackBerrydevice application should start the daemon module.
```
if( args.length == 1 && args[ 0 ].equals( "daemon" ) ) {
```
Create an instance of a class that contains the daemon functionality and items.
```
MLSampleDaemon daemon = new MLSampleDaemon();
```

Obtain a reference to the ApplicationMessageFolderRegistry.

ApplicationMessageFolderRegistry reg = ApplicationMessageFolderRegistry.getInstance();

In the main() method, check if the value of the args parameter indicates that the BlackBerrydevice application should start the UI module.
```
} else if( args.length == 1 && args[ 0 ].equals( "gui" ) ) {
```
Create an instance of a class that contains the UI functionality and items.
```
MLSampleGui gui = new MLSampleGui();
```
Display the UI for the BlackBerrydevice application .
```
gui.showGui();
```
Add the application to the event dispatcher.
```
gui.enterEventDispatcher();
```

Parent topic: Using custom messages and folders in the message list