Build versus Rebuild

When building a project, the build will also build dependent projects if they are not built, but will not build dependent projects if compiled .dlls already exist. A rebuilt will force a built of all projects "downstream" of a project without regard to whether or not they are built already. Builds will conditionally rebuild in scenarios when Visual Studio is wise to a change in a dependent project too, but this is "dangerous" because this sort of wisdom is seems pretty flaky and unreliable.