Basic Operation

All buttons can be activated with either the mouse or keyboard. The keypad works as expected, with the enter key, as well as the return key, equivalent to the [ = ] button on the calculator. If you don't have a keypad, you can enable the Keypad Emulation option, and use the M, J, K, L, U, I, O, 7, 8, and 9 keys as a numeric keypad.

Some of the buttons also have a secondary function that can be activated either by first pressing the [2nd] button or by holding down the control key while pressing the button. Pressing the [2nd] button or control key immediately changes the relevant buttons to indicate their new functions.

To switch between the full-function and the reduced four-function calculators, press the zoom box in the window's title bar. The four-function mode is similar in design and function to the Apple Calculator.