Content pools replace the previous concept of multiple external scenes. They add the possibility to dynamically create scenes from content that may not be known at the time of design. A content pool contains references to media files or previously exported scene files. A content pool is saved with a .disecontentpool extension.
Read more: File format support
R:\Images\ImageA.jpg R:\Videos\VideoB.wmv R:\Images\ImageN.png
The scene will take one item from the content pool every time it is displayed, covering the full screen with the default object length. In the dependencies for the DISE Movie, you can see that the dependency is for the .disecontentpool file, not the files in it. This means the content pool keeps its own dependencies, and is updated independently.
When you have multiple scenes sharing the same content pool, they will take one item from the content pool at a time. So, given the two scenes S1 and S2 share the pool with content C1, C2, C3, C4, C5, the playback order is S1 - C1, S2 - C2, S1 - C3, S2 - C4, S1 - C5 and so on.