It is possible to specify a title for a window, or part of a window. Several of the examples that you have already seen have used titles. There are two ways that you can create titles:
A title-pane is a blank pane into which text can be placed in order to form a title.
Any class that is a subclass of titled-object supports the
:title keyword. All of the standard CAPI panes inherit from this class. You can find all the subclasses of titled-object by using the Class Browser tool in the LispWorks IDE.
Specify a title for a CAPI window by supplying the
:title initarg for the interface, and access it with
Further control over the title of your application windows can be achieved by using set-default-interface-prefix-suffix and/or specializing interface-extend-title as illustrated in Controlling the interface title.
You can call interface-display-title to get the string that is actually displayed (or would be displayed if the interface was displayed).
The title of a titled-object, and its font, may be changed interactively with the use of
setf, if you wish.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017