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4.10 Multiple Calculators

It is possible to have any number of Calc mode buffers at once. Usually this is done by executing M-x another-calc, which is similar to C-x * c except that if a ‘*Calculator*’ buffer already exists, a new, independent one with a name of the form ‘*Calculator*<n>’ is created. You can also use the command calc-mode to put any buffer into Calculator mode, but this would ordinarily never be done.

The q (calc-quit) command does not destroy a Calculator buffer; it only closes its window. Use M-x kill-buffer to destroy a Calculator buffer.

Each Calculator buffer keeps its own stack, undo list, and mode settings such as precision, angular mode, and display formats. In Emacs terms, variables such as calc-stack are buffer-local variables. The global default values of these variables are used only when a new Calculator buffer is created. The calc-quit command saves the stack and mode settings of the buffer being quit as the new defaults.

There is only one trail buffer, ‘*Calc Trail*’, used by all Calculator buffers.