The functions set-interface-pane-name-appearance and set-interface-pane-type-appearance can be used to tell LispWorks to set some attributes (font, foreground, background) in specific panes (specified by name or type) inside specific interfaces (specified by type). They can be used to customize the appearance of the panes without changing the code that created them. For example, it can be used to customize the LispWorks IDE.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017