Meanwhile, melt margarine in large saucepan over medium heat. Stir in flour, salt, pepper and nutmeg; cook and stir until bubbly. Gradually add half-and-half, stirring constantly. Cook until mixture boils and thickens, stirring frequently. Remove from heat. Stir in fontina, Swiss and Parmesan cheeses until melted. (Cheeses will be stringy.) Stir in wine.