There are two approaches you can try.
1) CORBA notification service 2) CORBA one way method calls
Read about the CORBA notification service here for a quick reference. If you want to code and understand more, refer to Java programming with CORBA, 3rd Edition by Gerald Brose, Andreas Vogel and Keith Duddy (if your choice of language is Java. Otherwise, you can also get concepts, but not sample programs)
When it comes to one-way calls, you need to refer to the method, this follows the patterns of observers. You must define the onEvent method as a one-way method when you define idl methods. Google for info. Greetings.
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