A computer readable medium contains a data structure, which, in some embodiments, is an interface wrapper. The interface wrapper stores information about the interface such as a first data field that contains a reference to instrumentation, a second data field that contains data which represents a reference to an interface of a software program, and a third data field which contains data representing an identity of the unit of software. When a client unit calls a member function of the interface, the interface wrapper intercepts the call and invokes the instrumentation.

 
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