A few activities that would fall into these categories are jointly managed between Applications and those other areas. Many procedures mention contacting the Area Directors. It's less disruptive, more easily remembered, and more readily replied to than any other form of communication. Send your message to both of us. Even if one is the person you are talking to, it helps to keep the other one in the loop.
Short messages are more likely to be read and answered quickly.
And slide presentations are unlikely to be read at all. If you don't get an answer immediately, wait.