Copy the appropriate directory to your hard drive. It is approximately 1MB in size. You will get a screen of buttons where you can select demos by functional groups. Clicking in the background of subwindows will bring you back to the main chooser window.
Most demos wait for a keystroke or mouse click before terminating.
You can also get on-line help in the form of reference documents for writing your own programs. You will need Internet access to retrieve them. However, these files relate to the Macintosh and Windows editions of the language. The general language system documentation is provided here. These demo versions have a 150-line limit on program size.