ff-get-other-file
ff-get-other-file is an interactive autoloaded compiled Lisp function in `find-file.el
'.
(ff-get-other-file &optional IN-OTHER-WINDOW)
Find the header or source file corresponding to this file.
See also the documentation for `ff-find-other-file'.
If optional IN-OTHER-WINDOW is non-nil, find the file in another window.