I would think seriously about implementing SAP's Single Sign On solution. There are lots of documents and weblogs on SDN and the Service Marketplace with the details. But in short the EP will generate a logon ticket (a memory based cookie in the browser) that all the receiving systems will be setup to trust.
Although there is some setup in the receiving system's WebAS, this is really more of a topic for the EP and you might get more detailed answers in that forum.
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