Sony CLIE PEG-S300/E - Manual (Page 136)

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Using Basic Applications
Calculator menu commands
Calculator Edit menu
Copy and Paste
These commands may be used to copy a number from the Calculator and
paste it into another application. Similarly, you can also paste numeric
values you copied from another application such as the Expense into the
Calculator.
Options menu
Recent Calculations
You can review the last calculation you have made.
About Calculator
Shows the version information of the Calculator.