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We present a tool integration strategy based on enveloping pre-existing tools without source code modi cations or recompilation, and without assuming an extension language, application programming interface, or any other special capabilities on the part of the tool. This Black Box e n veloping (or wrapping) idea has existed for a long time, but was previously restricted to relatively simple tools. We describe the design and implementation of, and experimentation with, a new Black B o x e ndoi:10.1007/bf00132571 fatcat:l7pyefoyffaa3dtmyajwb5ykze