Expects: AX    0010H
CX    (X1) leftmost coordinate of exclusion rectangle (pixel)
DX    (Y1) top coordinate of exclusion rectangle (pixel)
SI    (X2) rightmost coordinate of exclusion rectangle (pixel)
DI    (Y2) bottom coordinate of exclusion rectangle (pixel)
                                                                  
Returns: none
                                                                  
Info: This sets a rectangle in which the mouse pointer will be hidden.

Unlike the limit range set by INT 33H 0007H and INT 33H 0008H,
the mouse may be moved into and out of the exclusion area, but it
will be hidden whenever there.

Avoid using this unless you immediately present some other sort
of screen-position indicator (such as a text cursor).  You don't
want the user saying "Where did my mouse go?"

Note that all X,Y coordinates are virtual coordinates and when
working with text mode, you must divide each value by 8 to get a
character clm,row.

Notes:   The exclusion area gets reset on each call to INT 33H 0001H
(show pointer) and to INT 33H 0000H (reset).

  All X,Y coordinates are virtual coordinates and when working
with text mode, you must divide each value by 8 to get a
character clm,row.

- -

INT 33H 0010H: Set Exclusion Area