要在ecilisp中创建一个计算器窗口，你可以使用GUI库，比如Tkinter。以下是一个简单的示例代码，展示了如何创建一个简单的计算器窗口：

(use-package "tk")(tk-init)(defparameter *calculator-window* (tk-toplevel))(tk-title *calculator-window* "Calculator")(defparameter *display* (tk-label *calculator-window* :text "0" :font '("Helvetica" 24)))(tk-grid *display* :row 0 :column 0 :columnspan 4)(defun update-display (text)(tk-config *display* :text text))(defun on-button-click (button)(let ((text (tk-cget button :text)))(if (string= text "C")(update-display "0")(update-display (format nil "~a~a" (tk-cget *display* :text) text))))(defun create-button (text row column)(let ((button (tk-button *calculator-window* :text text :command #'(lambda () (on-button-click button)))))(tk-grid button :row row :column column)))(loop for i from 1 to 9 do (create-button (format nil "~a" i) (floor (/ (- i 1) 3) 3) (mod (- i 1) 3)))(create-button "0" 3 0)(create-button "+" 1 3)(create-button "-" 2 3)(create-button "*" 3 3)(create-button "/" 4 3)(create-button "=" 4 0)(create-button "C" 4 1)(tk-event-loop)

运行这个代码后，将会创建一个简单的计算器窗口，你可以点击按钮来进行基本的数学运算。你也可以根据自己的需求来定制窗口的样式和功能。