Logon Group Configuration 
A logon group is a logical separation of instances and applications. You define logon groups to determine how client requests to certain applications are load balanced when your system setup uses the SAP Web Dispatcher or a third-party hardware load balancer in front of your application servers. For example, you can define a logon group so that a certain application (such as one with high CPU usage) is accessible only on the instances running on machines equipped with extra CPU resources.
Features
Depending on whether you have configured the alias as alias or prefix, the logon group name should be present or not present in the request URL. If the logon group name is included in the request URL, it is presented next to the application alias of the requested application (separated by the zone separator symbol).
Example
To request an application called TestApp that is specified as alias within the test logon group, you can use the following URL: http://<host>:<port>/TestApp~test/<application_resource>.
To request an application called TestApp that is specified as a prefix within the test logon group, you can use the following URL: http://<host>:<port>/TestApp/<application_resource>.
The logon group definition consists of the following actions:
Definition of the instance IDs of the Java instances in the cluster where applications from this group are accessible.
Definition of the application aliases of the applications that are requested with the corresponding logon group.
Activities
To display the overview page for existing logon groups, choose 
Configuration 
Infrastructure Java HTTP Provider Configuration Logon Groups 
,
or use the search. The Logon Groups tab page contains a table that lists all logon groups on all registered systems.
If you select a logon group from the list, the configuration settings for it are displayed in the Details screen area below.