Send the text between point and mark to the S process. As above, but returns you to the S process buffer as well. Send the contents of the edit buffer to the S process. As above, but returns you to the S process buffer as well. Useful when debugging for stepping through your code.
Displays result in a temporary buffer.
This is useful for quick calculations, etc. All the above commands are useful for evaluating small amounts of code and observing the results in the process buffer.