You can get context sensitive help in both the Screen Editor and the Source Code Editor. In the Screen Editor right click on the object. A popup menu will be displayed. One of the options near the top of the menu will be Get Help Information. Click on that item and the appropriate page from the help file will be displayed.
In the Source Code Editor you can right click on the command or function in the command tree list (right side of the screen). You can also select the command or function in your source code file and then right click on the selected command/function. In either case the appropriate page in the help file will be displayed. If you didn't select the entire word, or too much, the help routine will tell you it couldn't find the correct item.
The above is the command tree in the source code editor.