A Quantel term for a form of server-based nonlinear editing where only the change information, the EDL along with the any new video frames and audio created in the editing process, are sent back to the server from a connected edit station. For cuts-only editing, the stored result would simply be an EDL. If transitions are created, such as dissolves, wipes, DVE moves etc, these represent new frames that are processed by the editing workstation and sent to the server to be included as a part of EDL. Delta editing contrasts with dub editing or some NLE technology where every frame in the final edit has to be copied to a new file.
See also: FrameMagic