14. A method comprising: supplementing a set of web code with a set of instrumentation code, which when executed on a client computer collects a set of information that describes a document object model created by the client computer after the client computer executes the set of web code; sending the set of web code and the set of instrumentation code to the client computer; receiving the set of information from the client computer; identifying a resource on the client computer based on the set of information that describes the document object model.
14. A method comprising: supplementing a set of web code with a set of instrumentation code, which when executed on a client computer collects a set of information that describes a document object model created by the client computer after the client computer executes the set of web code; sending the set of web code and the set of instrumentation code to the client computer; receiving the set of information from the client computer; identifying a resource on the client computer based on the set of information that describes the document object model. 19. The method of claim 14 , wherein the resource is a JavaScript library that is executed within a browser on the client computer.