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DrRacket has lots of other features, including a complete manual. We'll explore more of DrRacket in later labs, and we encourage you to explore, but there's no need to learn all its features. 

Enabling Linux to open .ss files with DrRacket: 

1. Right-click any .ss file and select "Properties".\
2. Switch to the "Open With" tab.  If DrRacket already appears as a choice, be sure that it is selected,  otherwise
   1. Click the "Add" button.
   2. In the dialog box that appears, scroll down and select "DrRacket" and click "Add".
   3. DrRacket should now appear on the list of available programs. Be sure that the radio button for DrRcket is selected.
3. Click "Close".
4. Double-clicking the file will now open it with DrRacket.   You will need to run it once to get the Interactions window to appear or click "Show Interactions Window" from the "View" menu.

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Step-by-step Evaluation

While DrRacket evaluates our Scheme programs for us, it is also important for us to understand the process of evaluation. The details of evaluation will be covered in class. Here in lab, we want to explore two useful tools to help us:

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