On Help (How to Use this help)
Press F1 key to view the help screen suitable for the situation.
When F1 key is pressed on editing, the help item shall be searched with the word on which the current cursor is positioned as a key.
When F1 key is pressed when the cursor is positioned on a menu item, the corresponding help screen shall be displayed.
Pages concerning important commands are supplemented with ☆s. Use them as rough criterions.