Application Engine program composition.

Application	Section	Step	Action
Application Engine Program	Callable block of logic.	Logical grouping of actions.	Lines of code.
Composed of one or more sections	Composed of one or more steps. Specified by: ·  Market. ·  Effective date. ·  Effective status. ·  Platform.	Composed of one or more actions. Smallest amount of work that can be committed.	Used to: ·  Retrieve or manipulate data. ·  Control program flow.
First section MAIN 12- character name for application	Executed only when called, except for MAIN.	Executed from top to bottom within the section.	Must be unique within step. Executed in specific order.