calc-keypad
calc-keypad is an interactive autoloaded compiled Lisp function in `calc.el
'.
(calc-keypad &optional INTERACTIVE)
Invoke the Calculator in "visual keypad" mode.
This is most useful in the X window system.
In this mode, click on the Calc "buttons" using the left mouse button.
Or, position the cursor manually and do M-x calc-keypad-press.