There are two main help categories: About help and Program help.
About help is available only when Menu mode is selected. In Menu mode it can be accessed via menu item Help > About or by the toolbar About button.
Program help is also available when Menu mode is selected. In Menu mode it can be accessed via menu item Help > Program Help or by the toolbar Select application help button.
At most times Program Help can be accessed by pressing the F1 key. When the Command Sequence input dialog is open, Program Help can also be accessed by clicking the Help button in that dialog.