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## 15 Keypad Mode

The `C-x * k` (`calc-keypad`) command starts the Calculator and displays a picture of a calculator-style keypad. If you are using the X window system, you can click on any of the “keys” in the keypad using the left mouse button to operate the calculator. The original window remains the selected window; in Keypad mode you can type in your file while simultaneously performing calculations with the mouse.

If you have used `C-x * b` first, `C-x * k` instead invokes the `full-calc-keypad` command, which takes over the whole Emacs screen and displays the keypad, the Calc stack, and the Calc trail all at once. This mode would normally be used when running Calc standalone (see Standalone Operation).

If you aren’t using the X window system, you must switch into the `*Calc Keypad*` window, place the cursor on the desired “key,” and type `SPC` or `RET`. If you think this is easier than using Calc normally, go right ahead.

Calc commands are more or less the same in Keypad mode. Certain keypad keys differ slightly from the corresponding normal Calc keystrokes; all such deviations are described below.

Keypad mode includes many more commands than will fit on the keypad at once. Click the right mouse button [`calc-keypad-menu`] to switch to the next menu. The bottom five rows of the keypad stay the same; the top three rows change to a new set of commands. To return to earlier menus, click the middle mouse button [`calc-keypad-menu-back`] or simply advance through the menus until you wrap around. Typing `TAB` inside the keypad window is equivalent to clicking the right mouse button there.

You can always click the `EXEC` button and type any normal Calc key sequence. This is equivalent to switching into the Calc buffer, typing the keys, then switching back to your original buffer.

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