API Details

The "window"

x1 - row/upper left co-ordinate
y1 - column/upper left co-ordinate
x2 - row range/bottom right co-ordinate
y2 - column range/bottom left co-ordinate

Fore each request one of the following patterns must be met:

x1            -> return all cells in this row
x1,x2         -> return the rows in range x1-x2 (inclusive)
y1            -> return all cells in this column    
y1,y2         -> return the columns in range y1-y2
x1,y1         -> return the cell at x1,y1
x1,y1,x2,y2   -> return the cells bound by (x1,y1), (x2,y2)