Expects: AX    0007H
CX    minimum X coordinate (horizontal pixel position)
DX    maximum X coordinate (horizontal pixel position)
                                                                  
Returns: none
                                                                  
Info: This sets a horizontal range out of which the mouse pointer will
not be able to move.  Attempts by the user (or the program via
INT 33H 0004H) to move to the left of CX or the right of DX will
cause the pointer to remain at the minimum or maximum value in
the range.

Use INT 33H 0008H to limit motion on the vertical axis.

Notes: 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.

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INT 33H 0007H: Set Horizontal Range