Main window:
           In a main window you display text and data, 
which can cover several pages (flow text). As soon as a 
main window is completely filled with text and data, the 
system continues displaying the text in the main window of 
the next page. It automatically triggers the page break.
Secondary Window:
           In a secondary window you display text and data 
in a predetermined output area. There is no flow text 
display with page break. If you position a secondary window 
with the same name on several pages, the system displays 
the contents of this secondary window on each page.
Copy window
You use the copies window to define an output area for the 
print output, whose content you want to appear either only 
on the copy or only on the original. This allows you to 
flag copies as copies when the form is printed.

Final window:
You may want to display or query values on the first page 
that are determined only during processing. For example, 
you may want to name the grand total in the letter text of 
an invoice. However, this amount is determined only after 
listing all individual items. Or you may want to query on 
the first page within a condition the total number of 
pages, which the system calculates only after processing 
all pages.
In such a case, you use the final window: Processing first 
skips all windows of this type in the tree and works its 
way to the end of the tree. Only after the actual 
processing is finished, the final windows are processed in 
the order in which they appear in the tree (from top to 
bottom). Now any information is available that is known 
only at the end of the form processing.