This node is identical to the Composite ROP. Instead of referencing a COP to render from within the render output network, you can use this node in the COP network and simply connect the COP you want to render to its input.
The following examples include this node.
This example explores various methods of blurring an image using the Defocus COP.
This example shows various masking techniques with the Mask COP.
How to create a low-resolution scrolling text display (with old fashioned bulbs). This example uses the Tile, Font, Transform and various compositing COPs.