Communication Between Service and Form Application

Question

Would any kindly tell me if its possible to communicate between a service and a form application. For example, retrieve information from the service, like current activity or progress of its operations. In particular, I would like to to monitor more than just whether a service is running. In the system tray I would like to display whether the service is idle, or running a particular method. Is this possible? If so, should I be using MSMQ, or something else?