General Actions:
External code for displaying you can use, when you want to show a creative through BB AdServer. In that case setting of a creative, exchange ... is in your hand.
Use this type of setting e.g. for standard banner formats.
If a site set the creative and he asks you for measuring codes, choose one of these possibilities: Quick tracking dot X measuring point for external site?.
How to create a banner?
How to generate external code for displaying?