If you have not saved a mesh during the current TurboGrid session, selecting File > Save Mesh from the main menu opens the Save Mesh dialog box where you can type a filename for the mesh file(s). For details, see Save Mesh As Command.
If you have already saved a mesh during the current TurboGrid session, selecting File > Save Mesh from the main menu overwrites the file(s). To save a mesh to a different name, select File > Save Mesh As from the main menu. For details, see Save Mesh As Command.