I don't even know what I'm trying to do..!

Question

Hi. I have written two applications, one that is a service that runs all the time, and one that acts as an interface. I need to be able to send information from the application to the service - what am I trying to achieve (I can't even search for help as I don't know what I'm technically trying to do!) and how do I implement the code to all the service to raise an event when information is sent to it from the application?

Thank you in advance for any and all help

Chris