/sys$common/syshlp/helplib.hlb CC, Run-time functions, [w]delch  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Curses Screen Management function and macro that delete the
  character on the specified window at the current position of the
  cursor.  The delch macro operates on the stdscr window.

  Syntax:

       #include <curses.h>

       int delch();
       int wdelch(WINDOW *win);