Difference between OC4J Standalone & IIS for BI Presentation services

Hi experts,
i had this question in my mind for last couple of weeks and did not get good answer by self study.
my understanding with IIS & OC4J server is,
1.if BI Presentation services is setup to IIS Webserver, It is also using OC4J as application server, because IIS is just an HTTP Server where the presentation services also need an Application server which is OC4J for OBIEE. Is this true.
2.if the IIS Server is only HTTP Server, what is OC4J and standlone OC4J for OBIEE.
i think the difference between IIS and OC4J is ( true or false)
1. oc4j or oc4j Standalone is application server( contains OC4J Instance(J2EE) and HTTP Server)
2. oc4j itself has a an HTTP server which is used if we dont plan to deploy IIS Webserver.
3. IIS server is only HTTP which can be used in Production environments and will still use OC4j as application server.
MY question is how to configure IIS server and configuration files and oc4j if we plan to deploy a environment like this.
i followed OBIEE installtion documents and did not get a clear picture.
there is something called PLUG-IN's (iis plugin and j2ee plugin ) which is used if we deploying on IIS and OAS(WEBLOGIC)
this is is my understanding and Please Correct me if i am wrong
thanks
kumar

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    btw. if you are going forward with AIX you should perhaps consider switching oracle with db2. so you have a consistent IBM based landscape. also to me, sap and db2 seem to "like" each other more than sap and oracle
    regards,
    martin

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