Once you download the postscript, you can view it with your local postscript viewer.  On Unix machines you can use a program such as ghostscript or ghostview, which are freely available from  the Free Software Foundation. Or click here here to get information on how to obtain free postscript viewers for Windows-based machines. You will need both a Ghostscript interpreter (either Aladdin or GNU) AND a viewer (either GSview for Windows or GNU Ghostview for Unix). For instance, suppose you choose to download Aladdin Ghostscript 5.10. Then you will be prompted for the type of operating system. For Windows you will need the following zip files: gs510ini.zip, gs510w32.zip, and gs510fn1.zip. These are zipped files. Unzip them, follow the directions and you're off to the races.