Cream together butter, granulated sugar, and 1/2 teaspoon salt.
Stir in 2 cups flour.
Pat onto bottom of 13x9x2-inch baking pan.
Bake at 350° till lightly browned, about 20 minutes.
Beat eggs slightly with fork; add 1 tea spoon vanilla.
Gradually add brown sugar, beating just till blended.
Add 3 tablespoons flour and 1/2 teaspoon salt.
Stir in raisins and coconut.
Spread over baked layer.
Bake at 350° till golden brown, 20 to 25 minutes.
Combine powdered sugar, 1/2 teaspoon vanilla, and enough milk to make a glaze consistency.
Drizzle over warm cookies.
Cut into bars.