【更新说明】
* Hardware keyboard support (press '?' on keyboard to show mapping, see Help > Basic Operation for more details)
* RPN 'undo' function
* Four-row RPN display option
* Drag display to adjust RPN rows
* New click-sound options (see 'Button Feedback' in settings)
* Indian digit grouping (see 'Display Format' in settings)
* Samsung multi-window support with drag & drop (RealCalc Plus only)