A Control apparatus for controlling communication between a user and at least one processor controlled device, such as a printer or copier, capable of carrying out at least one task. The control includes a processor configured to conduct a dialog with the user to determine the task that the user wishes the device to carry out; instruct the device to carry out the determined task; receive event information related to events; determine whether the user is involved with another task when the event information is received; identify interrupt status information associated with at least one of the event for which event information is received and said other task; determine whether or not the user can be interrupted on the basis of the identified interrupt status information; and advise the user of received event information.