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.
#include <curses.h> int overlay (WINDOW *win1, WINDOW *win2);
| OK | Indicates success. |
| ERR | Indicates an error. |