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SAP GUI is based on the Windows Style Guide and is available for several platforms, providing

the same functions for each.

The following types of SAP GUI are available:

o SAP GUI for the Windows environment

SAP GUI for the Java Environment

SAP GUI for HTML

Java-based SAP applications are accessed using a browser.

The data flow between the presentation layer and the application layer does not consist of

prepared screens, but rather of logical, compact information about control elements and user

input (DIAG protocol).

SAP GUI for the Java Environment (abbreviated to: SAP GUI for Java) is written in Java and is the

platform-independent implementation of SAP GUI

SAP GUI for HTML consists of the Internet Transaction Server (ITS) in the Application Server

ABAP (short: AS ABAP) on the server side and a Web browser on the client side

The ITS is required to convert the SAP GUI data flow already in the AS ABAP into HTML and back

In this case, an HTML data stream is exchanged between the Internet Communication Manager

of the AS ABAP and the front-end.

The primary advantage of the SAP GUI for HTML is the simpler installation on the front-end; a

browser installation suffices.

When you login via the sap logon the list of server details are taken from the saplogon.ini file.

The sap logon program also enables logon load distribution.

Single sing on (SSO) – you ill not need to enter the information again to the system

A client represents a company several clients mean then there are several clients in the

company.

When you login with a particular client only data pertaining to that client is visible.

Client therefore correspond to independent business entity

On the logon screen, you also have the option of using the New password pushbutton to change

your password, at the most once per day.

SAP Notes contain detailed information on certain functions or corrections for known errors in

SAP products

The data for a particular user within a client is called the user master record.

Multiple logons to the sap system are logged due to both security and licensing

List of messages that comes up when we try to login more than once with the same login info

o Close all existing session(s) and log on again

o Keep existing session(s) open, and open an additional session (this is

recorded in the log).

o Terminate this logon

The sap GUI graphics is stored in the system and transported to the user every time the user

loges on.

The transported is in the compressed form

The graphic should not exceed 20KB.

System administrators can use table USERS_SSM to determine whether or not users are allowed

to switch between the SAP menu and their user menus.

The transactions SEARCH_SAP_MENU and SEARCH_USER_MENU search the corresponding

menus for the predefined text pattern.

The F4 key in the OK Code field lists the last 15 different entries in the OK Code field. This list is

stored in the registry on the front end and is valid for all sessions on the front end (regardless of

the system used).

RSPFPAR : T-code for viewing user parameters.

System Kernal

Sap is used to mapping business processes or business applications.

Should be independent of the hardware

o Hence netweaver has two runtime environmt

ABAP

Java

ABAP is the language developed by sap.

SAP standard programs are written in ABAP

According to the specification of J2EE the application logic is packed in EJB – enterprise

JavaBeans.

Client/ server

o Hardware oriented– server one that provides memory, storage and stuff to the

workstations (client)

o Software oriented - Defined at process level

The types of process can be categorized as:

o Presentation processes

o Application processes

o Database processes

When you configure the sap system you need to decided how the required processes are going

to be distributed some of them are:

o Single tier – all the processes are going to be on a single pc. The classical mainframe

o Two-tier – a special presentation consist to construct the graphics.

o Three-tier – all processes on its own host.

An instance is an administrative unit that combines SAP system components providing one or

more services.

The services provided by the instance starts or stops together.

You use a common instance profile to set the parameters of all components of a an instance.

Each instance have its own buffer area.

Instance run on one physical computer, can have multiple instance on a single computer.

An instance is identified by the system ID (SID) and the instance number.

The term (SAP) instance and application server are often used synonymously.

Only one database for a single SAP system.

The database usually has the same system ID (DB ID) as the SAP system

Central Instance – Offers more services than the other instances of the system.

o For AS ABAP – Message service, Enqueue services.

o For AS JAVA – Software Development Manager (SDM)

Central service instance – Provides services for AS JAVA, message service and the Enqueue

service.

All other instances in the system are called dialogue Instance.

If the central instance and the database are installed on the same computer then this computer

is referred to as the central system.

Every application server has a dispatcher and no of work processors depending on the resources

available

o Dialogue

o Spool work processors

o Update work processors

o Background work processors

o Enqueue work processors