When you change the classpath of an Eclipse project, the .classpath file changes so that if you send the project to someone else (including the .classpath file) they have the same classpath. But when you change a resource to "Derived", there is no change in either .project or .classpath. So where is Eclipse storing the information about which files and folders are derived?
Edit: I found this: "currently the derived state is stored in a single bit within a flag integer associated with each resource in the workspace tree file" but if someone could explain more precisely where that flag integer is stored, and how to change it, that would be quite appreciated.