In my opinion, you should not allow to print a bill if it's not saved. Also, you can use Jim's suggestion: make 2 sets of tables. In one set you save before the bill is printed and in the second after the bill is printed. In this way you will also have a proof against dishonest cashiers.

Vlad

>I have a developed a Point of Sale system on windows 95. Some cashiers are dishonest and before the bill is saved, they reboot by pressing Ctrl+Alt+Del. Can I disable these keys?
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>Thanks in advance,
>
>Abdul Ahad