Can a workbook be rendered "read-only" if Sheet1, A1 returns a value of
1 (A1=1)? In like manner, can the workbook return to normal use if the
cell's value is changed to 0 (A1=0)? Indeed, can the cell's value even
be changed to 0 if the workbook is "read-only"? If it can, let's
assume an entry in B1 of any value greater than 0 will cause A1=0.
Thanks.

Michael