Showing Tracking Number On Order Summary Page

Our previous shopping cart software (Interspire) had an input field on the admin order summary page. Without having to open the individual order, we could add the tracking number to the order info for our use as well as the customer.

Our order summary page doesn't have a field for the tracking number. Is it possible to include it? Is this a programming issue or a switch/check box that can be selected to show it?

Current version is 3.06

Please clarify what do you mean by "order summary page"? List of orders?