Other Scheme programs explicitly print output for the user during evaluation using write or display , or explicitly request input from the user using read or read-char . The mouse cursor becomes a watch whenever DrScheme is evaluating expression, but you can still use the mouse to move the selection in an input box.
Output goes to the same box as input.
In this example, display produces output immediately beneath the input you typed, but the final result was printed outside the box because it is the result of the program, rather than explicit output.