I need help sorting out how Web services work

I'm getting pretty darn confused with all the new terms I have to learn to develop a web service.
I want to deploy a simple java based web service on an IIS/ServletExec machine. To do so the documentation says I have to instal WSDP on the machine. Within a few seconds I get stuck.
When I try to install wsdp 1.6 it asks for a web container. I thought ServletExec is a web container, but it does not recognize it. What is a web container then? Should I just pick one of their options?
Sun Java System Application Server Platform Edition 8.1 Update 2 : What is this thingy? Doe it coem sith j2ee sdk already? If not, why?
Sun Java System Web Server 6.1 Service Pack 3 : What is this> How does it differ from the former thingy?
Tomcat 5.0 for Java WSDP 1.5 : Is this the Tomcat web app server? Does it stack on ServletExec?
I've deployed web pages on ServletExec, but am quite bewildered by the hoard of terms and tools thrown at me by the documentation for web services. What do I really need? It doesn't seem it should require much more than a jsp page would require, but I keep seeing the list of jar files and the like grow.
I need a web services for dummies that specifically deals with ServletExec and Java.
- Extremely confused

A Web container is a part of application server
i.e a web container is contained in application server.
So ServletExec already has a Web Container? All Web App Servers have a web container?
A Web Server is responsible only for web related
applications like JSP, Servlets, Web services, etc.
but an appliocation server can deploy EJB's also.
I thought the Web Server managed html and passed JSPs, Servlets, and Web Services on to the Web App Server. (With the exception of .NET type applications which run entirely on the front end Web Server). At least that is how we have our machine configured.
IIS, the Web Server, runs on a machine outside the firewall. It serves up all static html pages. All references to dynamic html (JSPs and Servlets) are forwarded to a Servlet Exec instance, the Web App Server, on a machine behind the firewall.
IIS can not process Web Services outside a .NET-type configuration. The documentation has led me to believe that I have to deploy a Java web service on a Web App Server like ServletExec.
>
Sun Java System Application Server Platform Edition 8.1 Update 2
is an application server provided by sun.
But the installation called it a web container. You just called it an applciation server. But you also said earlier that an applciation server is not a web container, but rather contains a web container. Should they have called it an applciation server.
(Just to make sure - application server = web app server, right?)
You can download bundle which contains j2eesdk
and application server together or you can download
seperately. Both these options are available on Sun's website.
I do believe ServletExec comes with j2eesdk, as I was able to run servlets without installing it. Though I did install jdk 1.5 and use it as my virtual machine when running Java, including any servlets.
Sun Java System Web Server 6.1 is responsible only
for web related applications like JSP, Servlets, Web services
etc but Sun application server 8.2 can deploy EJB's also.
So Web Server 6.1 is a front end web server which also serves up JSPs without having to call an application server? You only need an application server if you want to do EJBs?
Tomcat 5.0 for Java WSDP 1.5 : Is this the Tomcat web app server?WSDP containts several library files and other files
which are necessary for running a web service.
( lib files for sending and recieving SOAP request and
response i.e mail.jar activation.jar, saaj .jar ....etc).
It is not an application server. It acts as a supportive
role for creating and deploying web services.
That's what I thought. But I also thought Tomcat 5.0 IS a web app server (wheras Apache is the Web Server). It says "Tomcat 5.0 for Java WSDP 1.5" which does not make sense to me. Iwould think it would say "Java WSDP 1.5 for Tomcat 5.0" instead. What exaclty are they offering to download? WSDP or Tomcat? And if Tomcat, why are they calling it a web container when it is an application server? WSDP is not a web container, right? just some lib files for supporting web services.
Regards,
Piyush- still quite confused but grateful for your comments

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