Alice has two main editors -- the code editor and the scene layout editor.  Combined, they allow you to layout your scene with our library of 3D models, and then build animations and interactive content.

Code Editor

For convention we break the code editor layout down into 4 regions:

The Scene view is a window displaying your 3D scene.  Any objects you have added will be viewable (or not, depending on where they are positioned).  This window is interactive.  Selected objects can be repositioned via dragging them with your mouse, and the camera can be moved with the 4-way arrow buttons located in the bottom-center of the window.

In addition, you can play back your program by clicking the "Run" button.

Lastly, you can jump to the Scene layout editor by clicking the yellow "Edit Scene" link.  This editor provides a larger scene view and more advanced controls to manipulate your scene and the objects in it, in addition to object gallery access.  You can read more about this on the Alice 3 scene layout page.