When working on clips in modules, you view the effects of your work in the image window. The image window is similar to the Player except it renders uncommitted effects on-the-fly. As a result, real-time playback is frequently unsupported; however, the system plays back as many frames per second as it can render.
When you process clips in a module, you can load them into the Player for real-time playback without having to exit the module.