Calculator multi lines receipt, performs operations whilst recording a history.
The calculator JCalc can be used to do large calculations and has a history of 100 lines. You can go back to an operation as the results are automatically recomputed. The calculator JCalc remains open whilst you use other softwares programs. It is always visible... You can if you wish modify the height of the calculator to maximise the number of lines you see. You can save and reload your results...
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