A scene is a group of X-10 modules that can be set to predetermined levels simultaneously with a single command. Once you configure the modules for these scenes, you can send a single X-10 command to initiate the scene. There's no need to send multiple dim or bright commands to each module individually. First, you should be aware that different manufacturers implement the scene capability differently. Other devices are available that support scenes, and they may or may not work the same way.
Scenes work within a single house code.
That is, any lights you want put in a scene must be in the same house code. You can have up to four scenes in each of the 16 house codes. Any X-10 module can be included in all, some, or none of the scenes for its house code. Since an X-10 module has only one house code, each module can belong to a maximum of four scenes. Creating scenes is typically a one-time process.