Abstract: A technique is presented for dynamically inserting a function into an existing application executable of an object-oriented system at runtime of the executable and without requiring recompiling of the code. This is accomplished by modifying configuration settings of the executable at runtime to add a setting to specify the function for at least one class of the executable. The modified configuration settings are then used when running the executable and when a class is encountered for which the function is active, a redirection stub is dynamically inserted to implement the function for the methods of that class. In one embodiment, the function is a trace function and the redirection stub implements an entry trace and an exit trace about each target method of a class for which the trace function is active. Various CORBA implementations of the technique are possible.