The confusion here is with the lack of a "Save" menu item, Ed. The obvious conclusion for the original poster to draw is just to make the common-sense assumption that if there's no save option, there's no need for a save option.
The obvious reason for this is that Ghost image files are huge compressed archives, such that it's infeasible to implement something like Explorer in a way that treats a Ghost image as a document (the "save" option being a document-oriented piece of user-interface metaphor). Instead, modifications are applied immediately.
Indeed, this is completely normal for any software of this kind, such as Zip utilities. The 7-Zip archive manager doesn't have a "Save" option either, for the same thoroughly obvious reason; if a tool is designed to be able to work with up to hundreds of gigabytes of data in an archival store, it's not particularly sensible to try and abstract that away and give it a document interface. Instead, modifications are made immediately and in-place, and if a user wants the effect of a "Save" option (the only real effect of which is to enable *discarding edits by not saving*) then it's the user's job to work with a copy instead of the original.