How to check if the user has log in when he log in again?

Hi all,
I was wondering how to track if the user has already log in?
When this user using browser A to log in then he try to log in using a new browser, then hw I am I going to know that, and terminate his session?

Hello!
You can try this code if you want that if a user is login at a machine and tries to login from the other, then he can continue his processing at second machine ('cos it will get the high priority) but can not process from the first machine. This code allows to login but only second one will be active.
<jsp:useBean id="monitor1" scope="application" class="java.util.HashMap"/>
if(monitor1.containsKey(num)){
HttpSession oldSession = (HttpSession) monitor1.get(num);
oldSession.invalidate();
monitor1.remove(num);
monitor1.put(num , session);
But if you want to restrict it at the time of second login then u can use any of the techniques discussed above.
aNTUMNIHA

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How to check if the user has only the display authority of a message

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How to check if the user has only the display authority of a message but does not have the change authority for a certain message?
Best regards,

hi blake
though i am an application consultant and for authorisation u need to have help of BASIS person if u r not the one but still i can guide u regarding the same,
Basically Authorization Management
Use
You can use the following authorization objects to control the authorizations for maintaining business partner data:
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Authorization objects for relationships:
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You can also define authorizations for fields and field groups using the Business Data Toolset (BDT). Depending on the settings you have made, the system carries out the relevant authorization checks.
In the dialog in the SAP GUI, you can display an overview of the authorizations assigned to you by pressing the button Settings.
For more information on authorization management, see the Implementation Guide (IMG) of the Business Partner, as well as in the Developers Handbook for the BDT under Authorizations.
IntegrationAuthorization management for the Business Partner forms part of the SAP authorization concept.
Prerequisites
You have made the necessary settings in Customizing of the Business Partner under Basic Settings--> -Address Management.
Moving over
AS ABAP Authorization Concept
The ABAP authorization concept protects transactions, programs, and services in SAP systems from unauthorized access. On the basis of the authorization concept, the administrator assigns authorizations to the users that determine which actions a user can execute in the SAP system, after he or she has logged on to the system and authenticated himself or herself.
To access business objects or execute SAP transactions, a user requires corresponding authorizations, as business objects or transactions are protected by authorization objects. The authorizations represent instances of generic authorization objects and are defined depending on the activity and responsibilities of the employee. The authorizations are combined in an authorization profile that is associated with a role. The user administrators then assign the corresponding roles using the user master record, so that the user can use the appropriate transactions for his or her tasks.
Authorization Checks
To ensure that a user has the appropriate authorizations when he or she performs an action, users are subject to authorization checks.
The following actions are subject to authorization checks that are performed before the start of a program or table maintenance and which the SAP applications cannot avoid:
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        Starting reports (authorization object S_PROGRAM)
        Calling RFC function modules (authorization object S_RFC)
        Table maintenance with generic tools (S_TABU_DIS)
Checking at Program Level with AUTHORITY-CHECK
Applications use the ABAP statement AUTHORITY-CHECK, which is inserted in the source code of the program, to check whether users have the appropriate authorization and whether these authorizations are suitably defined; that is, whether the user administrator has assigned the values required for the fields by the programmer. In this way, you can also protect transactions that are called indirectly by other programs.
AUTHORITY-CHECK searches profiles specified in the user master record to see whether the user has authorization for the authorization object specified in the AUTHORITY-CHECK. If one of the authorizations found matches the required values, the check is successful.
Starting SAP Transactions
When a user starts a transaction, the system performs the following checks:
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The SAP system performs the authorization checks every time a user starts a transaction from the menu or by entering a command. Indirectly called transactions are not included in this authorization check. For more complex transactions, which call other transactions, there are additional authorization checks.
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If you create a transaction in transaction SE93, you can assign an additional authorization to this transaction. This is useful, if you want to be able to protect a transaction with a separate authorization. If this is not the case, you should consider using other methods to protect the transaction (such as AUTHORITY-CHECK at program level).
        The system checks whether the transaction code is assigned an authorization object. If so, a check is made that the user has authorization for this authorization object.
The check is not performed in the following cases:
You have deactivated the check of the authorization objects for the transaction (with transaction SU24) using check indicators, that is, you have removed an authorization object entered using transaction SE93. You cannot deactivate the check for objects from the SAP NetWeaver and HR areas.
This can be useful, as a large number of authorization objects are often checked when transactions are executed, since the transaction calls other work areas in the background. In order for these checks to be executed successfully, the user in question must have the appropriate authorizations. This results in some users having more authorization than they strictly need. It also leads to an increased maintenance workload. You can therefore deactivate authorization checks of this type in a targeted manner using transaction SU24.
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Starting Report Classes
You can perform additional authorization checks by assigning reports to authorization classes (using report RSCSAUTH). You can, for example, assign all PA* reports to an authorization class for PA (such as PAxxx). If a user wants to start a PA report, he or she requires the appropriate authorization to execute reports in this class.
We do not deliver any predefined report classes. You must decide yourself which reports you want to protect in this way. You can also enter the authorization classes for reports with the maintenance functions for report trees. This method provides a hierarchical approach for assigning authorizations for reports. You can, for example, assign an authorization class to a report node, meaning that all reports at this node automatically belong to this class. This means that you have a more transparent overview of the authorization classes to which the various reports are transported.
You must consider the following:
              After you have assigned reports to authorization classes or have changed assignments, you may have to adjust objects in your authorization concept (such as roles (activity groups), profiles, or user master records).
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please See also:
        SAP Notes 7642, 20534, 23342, 33154, and 67766
guess this info will help you,there is one graphic which actually explain the hierarchy of authorisation,i will find some time out to let u know more info about the authorisation
but if u sit with ur BASIS guy then u can learn lot of things in PFCG
i guess u r a basis guy,then its not a problem
best regards
ashish

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Message was edited by:
advaca

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The below solution seems overly complicated to me and can not be implemented without a custom screen and/or the use of JavaScript. Also, if your main concern is that a user may accidentally loose all their data because they closed the browser window or the session times out before they hit the save button then this solution does not help you.
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