WINDOW

THE BOX'S MAIN HELP:

These are the corners of the window into the image to be rendered.
If they equal or exceed the resolution, the window is set to the 
resolution.

XL (output):

This is the x pixel value for the lower left corner.

YL (output):

This is the y pixel value for the lower left corner.

XH (output):

This is the x pixel value for the upper right corner.

YH (output):

This is the y pixel value for the upper right corner.