The MCL editor, Fred
Choose the New command from the File menu.
You see two windows on the screen, your original Listener and a new Fred window. The new Fred window becomes the active window.

A Fred window displays an editor buffer, which contains a copy of the text you're editing. If the window is new, it doesn't yet correspond to a file on disk; the only copy is in the buffer. Otherwise the buffer contains a copy of the text from the file. When you save the window, its contents are copied to the file.
To enter text in your new Fred window, simply type.
"Hello, world!" and press the Return key.
Unlike text entered in the Listener, text entered in a Fred window is not immediately executed. However, you can easily execute the expression you have just typed.
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