Lets you choose which particular elements you want to render, and where to save them.
When you render one or more elements, a normal complete rendering is also generated. In fact, the element renderings are generated during the same rendering pass, so rendering elements costs little extra render time.
Rendering to elements is available when you do Production rendering.

The windows for each rendered element open cascaded on top of each other. Move one element's window to see another's.
This scrollable list shows the elements to render separately, and their status. To resize the columns in the list, drag the border between two columns.

The list includes the following columns:
To select an element, click its name in the list. Use Ctrl+click to select additional elements, or Shift+click to select a contiguous group of additional elements.
This field is useful if you have changed the name of an element.
These controls are for editing selected elements in the list.
The Enabled column of the elements list shows whether or not an element is enabled.
The Filter column of the elements list shows whether or not the filter is enabled for an element.
Disabling antialiasing can improve rendering time, although the rendered element that results might appear jagged.
This control is unavailable when multiple elements are selected.
Browse
(Browse) button to open the Render Element Output File dialog, which lets you choose a folder, file name, and file type for the element.
This control is available only when a single element is highlighted.
Common Parameters rollout, the render elements feature uses this name and path automatically as the basis for names of the various elements. It appends an underscore (_) and then the name of the element to the basic file name.
For example, if the render file name is "C:\render\image.jpg", when you add a Specular render element, the default path and file name for the rendered specular element is "C:\render\image_specular.jpg".
Similarly, when you enable output to a Combustion workspace (CWS) file, the file name you assigned is the default name of the CWS file.
For example, if the render file name is "C:\image.jpg," when you enable Combustion output, the default path and file name is "C:\image.cws".