  The General Boundary Formulation (GBF) is a new framework for studying
quantum theories. After concise overviews of the GBF and Schr\"odinger-Feynman
quantization we apply the GBF to resolve a well known problem on Anti-deSitter
spacetime where due to the lack of temporally asymptotic free states the usual
S-matrix cannot be defined. We construct a different type of S-matrix plus
propagators for free and interacting real Klein-Gordon theory.
