This option allows you to close a Set of Books in which you are working. The following menu will be accessible from the TurboCASH4 program if a Set of Books is closed: 

File menu - All options 

Tools menu - The Calculator, Data integrity check, Script Engine, Customise Language as well as the Plugins. 

Help menu - All options 

To close a Set of Books: 

1.Click on the File → Close Set of Books (F11) menu. 

F11

Please make regular backups of a Set of Books. 

If the Auto Backup is activated, and the Set of Books is not closed, a backup file will automatically be created when you exit / close TurboCASH4.