In order to bring more than just statically composited material in a compo, Smode introduces the concept of Bank.
In Smode, a Bank stores a specific type of object that has no effect on the output image (it is not drawn on screen, it is not an image, a mesh or a modifier).
There are three types of banks: for Animations, Parameters and Links.
A Bank has to modes - edit on and edit off:
When in edition mode, it lists its content as its children in the element tree. You can then add content to the bank, re-order it, remove it and edit its parameters.
When not in edition mode, your bank acts as a non-editable object whose parameters offer restricted control over its content: