VMS Help CC, Run-time functions, mv[w]insch  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Curses Screen Management macros that move the cursor to coordinates
  (y,x) and insert the character ch in the specified window.  The
  mvinsch macro acts on the stdscr window.

  Syntax:

       #include <curses.h>

       int mvinsch(int y, int x, char ch);
       int mvwinsch(WINDOW *win, int y, int x, char ch);