13. The non-transitory tangible computer-readable memory of claim 9 , further includes computer program instructions that, when executed, implement transmitting first modifiable data for display applying the publisher's base walkthrough version and second modifiable data for display applying the selected contributing author's walkthrough version, wherein the first and second data for display both are to be displayed simultaneously within a single user interface.
13. The non-transitory tangible computer-readable memory of claim 9 , further includes computer program instructions that, when executed, implement transmitting first modifiable data for display applying the publisher's base walkthrough version and second modifiable data for display applying the selected contributing author's walkthrough version, wherein the first and second data for display both are to be displayed simultaneously within a single user interface. 14. The non-transitory tangible computer-readable memory of claim 13 , further includes computer program instructions that, when executed, implement transmitting controls that implement drag-and-drop updating of a selected activity of the publisher's base walkthrough version with material from the contributing author's walkthrough version.