SAP ABAP Tutorials : Navigation

The SAP R/3 System is a client system. The client concept enables the joint operation, in one system, of several enterprises that are independent of each other in business terms. During each user session you can only access the data of the client selected during the logon.
A client is, in organizational terms, an independent unit in the R/3 System. Each client has its own data environment and therefore its own master data and transaction data, assigned user master records and charts of accounts, and specific customizing parameters.
A user master record linked to the relevant client must be created for users to be able to log on to the system.To protect access, a password is required for logon.The password is hidden as you type (you only see asterisks).SAP systems are available in several languages. Use the Language input field to select the logon language for each session.

Multiple logons are always logged in the system beginning with Release 4.6. This is for security as well as licensing reasons. A warning message appears if the same user attempts to log on twice or more. This message offers three options:
Continue with current logon and end any other logons in the system
Continue with current logon without ending any other logons in the system (logged in system)
Terminate current logon and the screen shot is as shown .
The standard SAP screen consists of following elements .
Command field: You can use the command field to go to applications directly by entering the transaction code. You can find the transaction code either in the SAP Easy Access menu tree (see next slide) or in the relevant application under System® Status.
Menu bar: The menus shown here depend on which application you are working in. These menus contain cascading menu options.
Standard toolbar: The icons in the system function bar are available on all R/3 screens. Any icons that you cannot use on a particular screen are dimmed. If you leave the cursor on an icon for a moment, a small flag will appear with the name (or function) of that icon. You will also see the corresponding function key. The application toolbar shows you which functions are available in the current application.
Title bar: The title bar displays your current position and activity in the system.
Check boxes: Checkboxes allow you to select several options simultaneously within a group.
Radio buttons: Radio buttons allow you to select one option only.
Status bar: The status bar displays information on the current system status, for example, warning and error messages.
A tab provides a clearer overview of several information screens.
Options: You can set your font size, list colors, and so on here.
SAP Easy Access is the standard entry screen displayed after logon. Using the menu path Extras® Set start transaction you can select a transaction of your choice to be the default entry screen after logon.
You navigate through the system using a compact tree structure that you can adapt to your own specific requirements. Use the menu path Extras® Settings to change your view of the tree structure. You can use this to display technical names (transaction codes).
Enter a transaction code in the command field:
A transaction code (T-Code) is assigned to each function in R/3 (not each screen).
You can access the assigned transaction code from any screen in the R/3 System.
You can find the transaction code for the function you are working in under the Status option of the System menu.
For example, to display Accounts receivable master data, enter “/n” and the appropriate
transaction code (in this case “/nfd03”).
combination to make the cursor move from one (input) field group to the next. Use TAB to move between fields within a group.
Use F1 for help on fields, menus, functions and messages.
F1 help also provides technical information on the relevant field. This includes, for example, the parameter ID, which you can use to assign values to the field for your user.
Use F4 for information on what values you can enter. You can also access F4 help for a selected field using the button immediately to the right of that field.
If input fields are marked with a small icon with a checkmark, then you can only continue in that application by entering a permitted value.
You can flag many fields in an application to make them either required entry fields or optional entry fields. You can also hide fields using transaction or screen variants or Customizing.
The R/3 System provides comprehensive online help. You can display the help from any screen in the system. You can always request help using the Help menu or using the relevant icon.

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