The Scheme Interpreter

Within SE you can invoke an interpreter for the Scheme programming language--a dialect of Lisp. This particular implementation of Scheme is called Elk (Laumann 1990). The Scheme interpreter allows access to signal documents and the change stack. In this preliminary release this interface is not documented. But you can use the Scheme interpreter for miscellaneous calculations, if you wish. To learn about Scheme, see Rees and Clinger (1986), Abelson, Sussman, and Sussman (1985). 

To change the appearance of the text in the Scheme window, use the operations under the Format menu.