The flow context of the HTML Hello World sample contains the essential data definition, such as full account information, selected sub account ID, and withdrawal amount, for a withdrawal transaction. The data is shared across pages and operations in the transaction flow. The operations contain operation level context data such as account information for the getAccountSummaryOp operation, and map input and output data with the flow context. In real HTML Channel applications, such as the web teller or internet banking, the design documents of the data and the context can be retrieved from the copybook of the back-end system.