Sometimes an application uses parts of another application, possibly one that is owned by another company. For example, your company offers subscriptions to a magazine but another company does the fulfillment. Or your company offers investment plans but another company manages the plans and collects the information from your employees. So how do you show the “outside” application? Should you make the other application look the same as the internal application? Or should you provide a link and say, “Click here for that other application. You will leave our application when you do so”?