Schematic entry and Spice simulations in ECEN4827/5827 are done using LTspiceIV which is a free, unrestrected Spice simulator available from and supported by Linear Technology. The Linear Technology site includes documentation for the tool. Further extensive information and help can be found at sites such as the LTspice yahoo group and the LTspice wiki.
You may download LTspice and use it on your own PC. The tool is also available in the Circuits Lab (ECEE 281) and the Power Electronics Lab (ECEE 1B65).