All symbols in this manual are exported from either the CAPI or COMMON-LISP packages unless explicitly stated otherwise. To access CAPI symbols, you could qualify them all explicitly in your code, for example capi:output-pane.
However it is more convenient to create a package which has CAPI on its package-use-list:
(defpackage "MY-PACKAGE"
(:add-use-defaults t)
(:use "CAPI")
)
This creates a package in which all the CAPI symbols are accessible. To run the examples in this guide, first evaluate
(in-package "MY-PACKAGE")
CAPI User Guide and Reference Manual (Unix version) - 3 Aug 2017