ses-set-header-row
ses-set-header-row is an interactive compiled Lisp function in `ses.el
'.
(ses-set-header-row ROW)
Set the ROW to display in the header-line.
With a numerical prefix arg, use that row.
With no prefix arg, use the current row.
With a C-u prefix arg, prompt the user.
The top row is row 1. Selecting row 0 displays the default header row.