What do you mean by object spy? How can one use it?

Object Spy is a feature in Unified Functional testing in which both test properties and run-time properties and methods can be viewed. Syntax of the selected method is also given by object spy. Object spy shows the complete hierarchy of the object which has been selected by the user. It is basically a utility to add objects which can be accessed from the toolbar and is used to add objects to the object repository.