In Real Desktop 2.0, you can add more rooms in addition to the standard desktop room. Move the pointer over the menu bar (at the top of the screen) and choose Room -> New. Then the the dialog "Browse for folder" apper, where you need to choose the folder whose content should be displayed in your new room, and click OK.
In the following dialog "New Room", you can setup further adjustments to the new room. By default, the name of your selected folder is used as a room name. You can use any name you like for your new room, this will have no effect on your selected room folder. Under Folder you can seen the current path and may change it by clicking the "Browse" button and selecting the new folder.
Under Monitor you can choose a monitor where your new room should be displayed. Usually only one monitor should be present, so \\.\DISPLAY1 should be the only choice for you, as long as you don't plug in a further monitor. Finally, you can setup under Design the start design for your new room. The design defines the color of the walls and the font of the files in this new room.