The WINDOW option sets the value for the w window argument used in various date-related built-in functions.
>>-WINDOW--(--w--)---------------------------------------------><
The value for w is either an unsigned integer that represents the start of a fixed window or a negative integer that specifies a "sliding" window. For example, Window(-20) indicates a window that starts 20 years prior to the year when the program runs.
DEFAULT: WINDOW(1950)