Caption - %ca[title]
%ca defines the title for a format window. The title is supplied as a standard
character string.
For example:
i=winio@('%ca[Error]')

The caption will be re-drawn whenever the window is refreshed. This means that
if the title is supplied in the argument list (signified by the "@" character
in the format string) then the window title can be changed dynamically by
changing the contents of the string and calling window_update@.
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