Final window is to be used where there is a REQUIREMENT to show/display details that has to be PROCESSED only at the end of the form processing.

The WINDOWS in a page are processed from top to bottom. So the execution first skips all the Final windows and completes the processing of other windows. Once all the non-final windows are processed, the Final windows are processed from top to bottom. 

For example if there is a requirement to display the total VALUE of all the items on the first page but the total value is KNOWN only at the end of the form processing, we can use the Final window for displaying the total value. The sum of line items is calculated in the MAIN window.

Final window is to be used where there is a requirement to show/display details that has to be processed only at the end of the form processing.

The windows in a page are processed from top to bottom. So the execution first skips all the Final windows and completes the processing of other windows. Once all the non-final windows are processed, the Final windows are processed from top to bottom. 

For example if there is a requirement to display the total value of all the items on the first page but the total value is known only at the end of the form processing, we can use the Final window for displaying the total value. The sum of line items is calculated in the MAIN window.