The main toolbar gives you access to the main tools of the program:
file functions
clipboard functions
undo/redo operations
drawing tools
hot spot select (for cursor)
The triangle in the right lower corner of a button signifies that you can click
on it to use the extended abilities of the tool. Double-clicking
on some buttons calls predetermined operations which are described
in the Tips by one string section.
You can change the current drawing tool by clicking a highlighted
button.