A common interface (API) is provided which permits a single diagnostic probe manager to communicate with and to control a plurality of diagnostic probes. Through this interface the diagnostic probes are enabled to pass information concerning dependencies between software levels present in a hierarchical stack. This information is particularly useful in that it permits the probe manager to direct diagnostic efforts at the lowest desirable level so as to avoid the problems that occur when problems are indicated at a high level but which are actually caused by lower level software components.

 
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> Method and apparatus for using a fault tolerant memory in processor testing and design

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