POSTPROCESSING
POSTPROCESSING references a method that does things after a layer has been decoded. Such methods serve a purpose when decoded data needs to be saved for use in decoding subsequent layers or frames. We call such data "intra-frame data" if it is used across multiple layers within a frame, and "inter-frame data" if it is used across multiple frames. We might, for example, save a command code so that we can properly interpret a command-specific reply. As with PREPROCESSING methods, you can have multiple POSTPROCESSING methods in a decoder. Note that some simple forms of data are available that don't require POSTPROCESSING methods.