difference bet. external session and internal session?

[Former Member]

hi all

wat is the difference bet external session and internal session? where do we get this concept

[Former Member]

Hi,

External session: - when user logs on to R/3 system, the system Creates a new terminal session called external session. E.g. System Session.

Internal session: - created by calling a transaction (with CALL TRANSACTION), a dialog module (with CALL DIALOG) or a report (with SUBMIT or RETURN).

In general each user can open up to six R/3 windows in a single SAPgui session. Each of these windows corresponds to a session on the application server with its own area of shared memory.

The first application program that you start in a session opens an internal session within the main session. The internal session has a memory area that contains the ABAP program and its associated data. When the program calls external routines (methods, subroutines or function modules) their main program and working data are also loaded into the memory area of the internal session.

Only one internal session is ever active. If the active application program calls a further application program, the system opens another internal session. Here, there are two possible cases: If the second program does not return control to the calling program when it has finished running, the called program replaces the calling program in the internal session. The contents of the memory of the calling program are deleted. If the second program does return control to the calling program when it has finished running, the session of the called program is not deleted. Instead, it becomes inactive, and its memory contents are placed on a stack.

The memory area of each session contains an area called ABAP memory. ABAP memory is available to all internal sessions. ABAP programs can use the EXPORT and IMPORT statements to access it. Data within this area remains intact during a whole sequence of program calls. To pass data to a program which you are calling, the data needs to be placed in ABAP memory before the call is made. The internal session of the called program then replaces that of the calling program. The program called can then read from the ABAP memory. If control is then returned to the program which made the initial call, the same process operates in reverse.

All ABAP programs can also access the SAP memory. This is a memory area to which all sessions within a SAPgui have access. You can use SAP memory either to pass data from one program to another within a session, or to pass data from one session to another. Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters). These parameters are often used to preassign values to input fields. You can set them individually for users, or globally according to the flow of an application program. SAP memory is the only connection between the different sessions within a SAPgui.

Check the below links for more information...

http://help.sap.com/saphelp_47x200/helpdata/en/9f/db9e0435c111d1829f0000e829fbfe/content.htm

I hope this answers yor question

Regards,

Padmam.

[Former Member]

Hi Santosh

when a sub routine or a function module is called from a program/report , is it executed as an internal session

ABAP Memory - Internal session export import

SAP Memory - External session set get

reward points to all helpful answers

kiran.M

[seshatalpasai_madala]

Hi,

External Session is per main window and Uses SAP memory to share data between External sessions. An External session is started when you start a program and when ever you use CALL TRANSACTION. Data stored in SAP memory is there till you logoff.

Internal Session is a session with in the External session there can be many internal sessions in an External Session, You can use ABAP memory to share data between Internal session. SUBMIT statement creates an internal session and replaces calling programs internal session if you dont want that use SUBMIT with RETURN.

Regards,

Sesh