The Atlantis event display program has two independent systems for online help, tooltips and online documentation. The tooltips are integrated into the program, the online documentation is placed outside the program, but is shown in a pop-up window when referenced from the program.
Tooltips
Tooltip help consists of short text messages associated with practically every graphical component of the user interface. You obtain these messages by stopping the mouse cursor in the area you want to get help for. If a message exists for the component it will appear on the screen after a few moments.
Online documentation
The online documentation is a hierarchically organized set of pages, linked to each other by hypertext links. These pages provide much more detailed descriptions than tooltips, but not every graphical component has an associated page. The online documentation is displayed in the help pop-up window (see 3.3.6. Help Window) that is opened via the Help→Online Help System menu option of the menu of the Control Window (see 3.1. Control Window). This window contains the table of contents in the left margin for easy navigation.
The hierarchy of pages is reflected in the terms chapter and section.
In the help pop-up window you can start navigating and use the Table of Contents to directly go to the page you are interested in.
An alternative and more direct way to access the online documentation of a graphical component is to right-click on that component. This will show the available help page directly in the help pop-up window.
The online documentation is also accessible via the Atlantis website, both as webpages and as PDF document (select Documentation in the left margin of a webpage of the Atlantis website).