A displayed CAPI pane or interface.
A Lisp object (not necessarily a string) to make available within the local Lisp image.
The string representation of
to export, or
is a string, then that will be exported as the string.
A property list of additional format/value pairs to export. The currently supported formats are
:string, whose value should be a string, and
:image whose value should be a image object. This allows you to export more than one format simultaneously.
Note that X applications may or may not use the primary selection for their paste operations. The most likely explanation for apparent inconsistencies after
set-selection is that the pasting application does not use the primary selection. For instance, Emacs is configurable by the variable interprogram-paste-function.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017