Sets the active area for printing and saving pictures.
area input must be a list of the form: [XLow YLow XHigh YHigh].
All members must be integers.
You can achieve the same effect by using Bitmap - Active Area from the menu.
BITBLOCK 100 100 SETACTIVEAREA [0 0 50 50] BITSAVE "myfile.bmp CLEARSCREEN BITLOAD "myfile.bmp
See how only part of the image that was within the active area was restored.