SCREEN
Draws rectangular frame and fill it with given symbol.
CALL AJ.CHAR.WINDOW( X, Y, X2, Y2, C)
| Parameter | Description |
| X | x-coordinate of the top-left corner |
| Y | y-coordinate of the top-left corner |
| X2 | x-coordinate of the bottom-right corner |
| Y2 | y-coordinate of the bottom-right corner |
| C | Symbol for fill |