Describe the window types in SAPScript. | SAP-ABAP

 Following are the window types in SAPScript:
=>    MAIN-- In this window output is continuous text. It is used by layout set and dialog users of output program.
 =>     VAR-- This window contains variables. It is formatted for each page. The text can differ on each page in which window is positioned.
=>    CONST-- This window contains constants. It is formatted only single time.