How to use Webdispatcher as a load balancer?

We have multiple java instances for an EP7.
We want to use a webdispacher to do load balance.
I saw one document before but cannot find it anymore.
Please help. Points guaranteed. Thanks!

Check this SAP help documentation
http://help.sap.com/saphelp_nw04s/helpdata/en/5f/7a343cd46acc68e10000000a114084/content.htm
Regads,
Prasanna Krishnamurthy

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Hi Friend,
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Hi,
The message server and Logon group are there for balancing the load among application servers within a SAP system. You are using the SAPServer class to implement an external RFC server that usually serves the request from SAP servers. So using message server and logon group with an external server doesn't make sense.
I understand that both your DB server and the application server in question are Windows machine with .NET runtime installed and you started the SAPServer programs directly from Windows command line. If so, the error message for the KO case says that the hostname BEAUSR214 could not be resolved from the application server. I also noticed that the hostname BEAUSR214 in error message doesn't match the hostname BEAUSR213 given in command line.
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How to use Webdispatcher as a load balancer?

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