The user can't write the workbook. The workbook is only visible in the
background, on the foreground there is a userform where the user can
make some changes. All this changes can be made with the mouse, so the
mouse should work as usual. I let the scanner put the scaned code in a
textbox in the userform. Now I will that it is impossible for the user
to edit this textbox, but the scanner should still be able to put
values into it.