One surefire way I know of to make sure your additional include files get pushed to load generators is to add them to the script in VUGen. This can be accomplished in VUGen by going to the File menu and selecting ''Add to script.'' Any files you select will be added to the action navigation pane in VUGen and will be automatically pushed to any load generators during a test. You should not have to map any directories on the load generators if you use this method.
If you are using a shared file (such as a function header) that you do not want to attach to all scripts, just make sure that the directory linked to in the script is accessible on all load generators. If not, the appropriate mappings must be completed so the file is accessible during test runs.