The tool-bar provides single access for commonly used operations. The tool-bar can be dragged of to a floating bar. Instant help for any button can be obtained simply by hovering the mouse over it until a tool-tip "bubble" appears describing its purpose. Alternativelty here is a complete list of each button's purpose :-
Creates a new project file - equivalent to the File | New Project menu option | |
Opens an existing project file - equivalent to the File | Open Project menu option | |
Closes the current project file - equivalent to the File | Close Project menu option | |
Saves the current project file to the same file - equivalent to the File | Save Project menu option | |
Toggles display of the project tree-view to the left of the display | |
Launches these help pages - equivalent to the Help | Help Topics menu option |