For example, the main keyword mammals might have the subkeys primates and ungulates . Of course, the user's ability to find a topic based on keywords depends entirely on the Help-system designer's expertise in specifying logical keywords. When the Index page fails, the Find page permits a full-text search of the Help system. Help designers rarely supply a full-text index along with the Help file, because WinHelp 4 automatically creates the index the first time it's needed. A Help system can have as many as 255 different secondary-window classes, and individual topics can be linked to a specific window style.
Secondary windows can now have toolbar buttons as well.
The designer can specify the window's relative size and screen location and optionally make it adjust its height to fit the topic. An authorable button looks like an ordinary push button, except that it's shorter from top to bottom and can be used as a hotspot to trigger a jump, pop-up, or macro. A shortcut button is a tiny square button with a picture of an arrow, like the familiar shortcuts on your Windows 95 desktop. This type of button usually performs a task for the user. And a mini button is a tiny blank square that optionally has text beside it.