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D-instanton effects are studied for the IIB orientifold T^2/I\Omega(-1)^{F_L}of Sen using type I/heterotic duality. An exact one loop threshold calculationof t_8 \tr F^4 and t_8(\tr F^2)^2 terms for the heterotic string on T^2 withWilson lines breaking SO(32) to SO(8)^4 is related to D-instanton induced termsin the worldvolume of D7 branes in the orientifold. Introducing D3 branes andusing the AdS/CFT correspondence in this case, these terms are used tocalculate Yang-Mills instanton contributions to four point functions of thelarge N_c limit of N=2 USp(2N_c) SYM with four fundamental and oneantisymmetric tensor hypermultiplets.Comment: 25 pages, harvmac(b), one figure, v2: minor changes, version to  appear in PR

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Heterotic–type-I duality, D instantons, and an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>AdS-CFT correspondence

Heterotic–type-I duality, D instantons, and anN=2AdS-CFT correspondence