URGENT! Configuring Servlet

[Himal Chuli]

hi folks,
i am working in IBM WebSphere Test Environment for Java and trying to deploy web components. since i am new to it, i am facing problem like followings:
In Tomcat, we could create multiple web application and run whichever we like such As:

   webapp
      --myApp (called servlet context)
          index.jsp
          --WEB-INF
          --lib
             ---classes
      --yourApp
          yourindex.jsp
          --WEB-INF
          --lib
             ---classes

These myApp and yourApp servlet context can be defined in servlet.config file in tomcat.
so we can run these two web app like this
http://localhost:8080/myApp/index.jsp
http://localhost:8080/yourApp/yourindex.jsp
this is exactly what i am trying to do in WebSphere Test Environment. now the problem is where can i define these ServletContext.
and also i found a file in
D:\Program Files\IBM\VisualAge for Java\ide\project_resources\IBM WebSphere Test Environment\properties\default.servlet_engine which looks like a configuration file.
it has codes like these

<websphere-servlet-engine name="servletEngine">
   <active-transport>http</active-transport>
   <transport>
      <name>http</name>
      <code>com.ibm.servlet.engine.http_transport.HttpTransport</code>
      <arg name="port" value="8765"/>
      <arg name="maxConcurrency" value="50"/>
      <arg name="server_root" value="$server_root$"/>
   </transport>
   <websphere-servlet-host name="default_host">
    <websphere-webgroup name="default_app">
       <description>Default WebGroup</description>
       <document-root>$approot$/web</document-root>
       <classpath>$approot$/servlets$psep$$server_root$/servlets</classpath>
       <root-uri>/</root-uri>
       <auto-reload enabled="true" polling-interval="3000"/>
       <shared-context>false</shared-context>
    </websphere-webgroup>
.
.
.  

what are $server_root$ and $approot$? where are these value are set?
it would be a great help if anyone could explain me these things.
thanks.

[bharat nagpal]

you might be aware of the fact that WTE(Websphere Test Environment) is a subset of WAS.
when you start the WTE , it checks for three files
1) default.servlet_engine
2) appName.webapp
3) session.xml
you will not require changes in session.xml, while developing a simple application
anyways you define all the applications, in default.servlet_engine...
this is just like server.xml for tomcat. I mean properties file for servlet engine.
this is not application specific...
here is an example for you.
<websphere-webgroup name="check1">
<description>check1</description>
<document-root>$approot$/web</document-root>
<classpath>$approot$/servlets$psep$$server_root$/servlets</classpath>
<root-uri>/check1</root-uri>
<auto-reload enabled="true" polling-interval="3000"/>
<shared-context>false</shared-context>
</websphere-webgroup>
I'm not sure , but according to me the "server_root" is set when we install the VAJ
for this example as <root-uri> is /check1
so to run index.html in check1 you will specify
http://localhost:8080/check1
and there should be a properties file named "check1.weapp" in folder /check1/servlet/
where you need to define all the servlets
this file is similar to web.xml in tomcat
<servlet>
<name>MainServlet</name>
<description>Main Servlet</description>
<code>com.check1.common.MainServlet</code>
<servlet-path>/MainServlet</servlet-path>
<autostart>true</autostart>
</servlet>
hope this helps...