The Simplesem abstract semantic processor is described in Section 2.6 of your textbook [G&J98]. Other important references are available from the website of the authors:

A user's guide to Simplesem

A conference paper on Simplesem, with a good basic introduction to Simplesem concepts

The source of Simplesem (in Java, zipped)

The Simplesem applet

Simplesem has been installed on the departmental Sun workstations. In order to use them most easily, I recommend that you add the following line to your .cshrc or .tcshrc file:
source /usr/local/etc/csce330/csce330-fall01.csh
In this way, your CLASSPATH environmental variable will be modified to include the directories with the relevant Java libraries, and your PATH environmental variable will be modified to include the directories with the relevant executable files. (As I write these notes, the changes in the PATH variable are not useful for CSCE 330 students yet.) Please do not remove the other lines in your .cshrc or .tcshrc; in particular, leave the line
source /etc/cshrc

After you do this, you may execute the Simusem abstract semantic processor by typing
java simplesem
at the Unix prompt.