overlay

   Nondestructively superimposes win1 on win2. The function writes
   the contents of win1 that will fit onto win2 beginning at the
   starting coordinates of both windows. Blanks on win1 leave
   the contents of the corresponding space on win2 unaltered. The
   overlay function copies as much of a window's box as possible.

   Format

     #include  <curses.h>

     int overlay  (WINDOW *win1, WINDOW *win2);
 

Additional information available:

Arguments       Return_Values