a question about j2ee server

I'm a j2ee begin learner and the reader of headfirst ejb.when I have read chapter1 ,I downloaded java EE 5 SDK Update 2. I cann't find the deploytool descripted in the book,although the sdk has a server.does the server in j2ee sdk is the RI server refered to in the book .what is the relation and difference among RI , the server in the sdk and the server named glassfish.thank you.

If you're reading the Head First EJB, then you need to download J2EE 1.3 and not Java EE 5.

You can download it from this link:
http://java.sun.com/j2ee/sdk_1.3/

thank you for your answer.after having read your reply,I installed the j2ee1.3. when I enter the j2ee install directory ,and run j2ee -verbose the system shows :"error:set java_home before running this script",although I have
set java_home before I run j2ee server.what is the reason?how to solve this
problem?thank you

Actually I'm not sure as I never install J2EE 1.3 before. But from the error message it seems that you haven't set the JAVA_HOME.

If you use Windows, you can try this in the command prompt.
set JAVA_HOME=<installation_path>

If you use Linux, you can try this in the shell.
export JAVA_HOME=<installation_path>

alternatively you can use the command by running cmd from your run. I mean command prompt
set classpath=.;<java installation location on your computer\lib;<J@EE server installation location>\lib\j2ee.jar
set JAVA_HOME=<java installation location on your computer>
set J2EE_HOME=<J2ee server intallation location on your computer>