Q13: What is system overview of Oracle E-Business Architecture?
Q14: What are the main differences between Oracle Applications 11i and R12 system?
Q15: Is E-Business Suite multi-tier?
Q16: What are the principal components of Application tier?
Q17: How many Oracle Home Directories and File System in EBS?
Q18: What is the environment files in Oracle Applications?
Q19: why Oracle E-Business have two distinctly different user interfaces?
Q20: I heard Oracle JInitiator is obsolete in post-R11i, why?
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Q13: What is system overview of Oracle E-Business Architecture?
I.The applications(Oracle Financials,Oracle Human Resources,Supply Chain Management,Customer Relationship Management,Project Management)
II.Applications Foundation Layer/Applications Object Library
III.Oracle Tools and JDeveloper Components(Oracle Forms,Oracle Reports,BI Publisher,OA Framework/BC4J
IV.Oracle Database Server
Q14: What are the main differences between Oracle Applications 11i and R12 system?
Yes,the main differences between Oracle Applications R11i and R12 are in the application tier.
In 11i, Web Server(Apache 1.3.19), OracleAS 1.0.2.2.2,Apache JServ 1.1.2 Servlet Engine.
In R12,Web Server(Apache 1.3.34), Oracle Application Server 10gR3, OC4J (Oracle Components for Java 10.1.3—a J2EE-compliant engine)
In 11i, Forms Developer 6i installed in ORACLE_HOME 8.0.6,BI Pulisher, Reports 6i.
In R12, Forms Server 10gR2 installed in ORACLE_HOME 10.1.2,BI Publisher, Reports 10gR2
Q15:  Is E-Business Suite multi-tier?
Yes, it is. Oracle Applications R11i and R12 are based on a three-tier architecture, which is client tier, application tier, also known as the middle or mid-tier, and database tier.
Q16: What are the principal components of Application tier?
The principal components of the Oracle Applications application tier include following:
Web server
Forms server
Concurrent Processing server(multiple jobs can be run simultaneously on one or more nodes)
Reports server(R11i)
BI Publisher
Admin server(R11i)(maintain the apps db objects, apply patches, perform upgrades)

Q17: How many Oracle Home Directories and File System in EBS?
APP_TOP contains Oracle Applications product directories such as General Ledger (GL), Purchasing (PO), and many others.
COMMON_TOP contains common directories and files such as log files and Java libraries shared across different products.For example, the admin directory under COMMON_TOP is the default location where Concurrent Managers write the output and log files from concurrent program requests.
ORACLE_HOME  refers to the installation directory where an Oracle software component is installed. In 11i, ORACLE_HOME 8.1.7(OracleAS 1.0.2.2.2), ORACLE_HOME 8.0.6(Oracle Developer 6i),ORACLE_HOME 10.2(Oracle Database). In R12, ORACLE_HOME (OracleAS 10.1.3),ORACLE_HOME 10.1.2(Oracle Developer 10g),ORACLE_HOME 10.2(Oracle Database).
DATA_TOP contains database data files for Oracle Applications.
INST_TOP is new to R12. It contains various configuration files to provide the ability to share Applications and technology stack code between multiple instances.
Q18: What is the environment files in Oracle Applications?
Environment files are the type of configuration files usually used to set up a working environment to point to the various top-level directory structures such as COMMON_TOP and other environment variables such as NLS_LANG relevant to Oracle Applications configuration.
 For applications developers, the most important environment file is the consolidated environment file APPS<CTX_NAME>.env in the APPL_TOP directory.
Q19: Why Oracle E-Business have two distinctly different user interfaces?
Two different user interfaces are the Forms-based and HTML-based interface.
The Forms-based or Professional interface is better suited for users who interact with the system daily,such as an accounts clerk who is required to enter the data quickly. On the other hand, the HTML-based Self-Service interface is better suited for casual users, such as an employee who infrequently enters expense claims and subsequently checks the progress of the expense claim in the system through the Self Service HTML-based screens.
 This is particularly evident in R12, where most of the application’s user interfaces are converted into HTML-based screens.
Q20: I heard Oracle JInitiator is obsolete in post-R11i, why?
Oracle JInitiator is a Java Runtime Environment (JRE) that is delivered to the client desktop computers. It replaces the default JVM in browsers such as Internet Explorer. At the time it was released, it provided a number of additional features over the standard JVM plug-in, such as JAR file caching and on-demand loading.
 This approach has become obsolete in post-R11i releases in favor of using the standard Java plug-in.  Oracle’s JInitiator has its own JVM which, on occasion, conflicted withJVMs from other vendors.