You don't need any special software (other than an Internet Browser) to take this course.
While the majority of references in the course are in "text" format, you might want to access one that is in "PDF" format. These references can be viewed and printed with Adobe Reader which is available free from Adobe Corporation and may be downloaded and installed on your computer. (Link to EPA's PDF page)
Now, let's look at the definition of a Special Government Employee.