RAS session count

Hi,
In my configuration, the RAS Java SDK is used to access some unmanaged reports stored in a server folder. In the same web browser session, it is noted that for each report opened, the CAS count will simply increment accordingly. Is that normal? Shouldn't the licensing be based on the RAS session connected? Is it related to my way of calling the RAS API?
Thanks,
John

Answering what I can below in Italics.
From the kb note, it seems I can programmatically (instead of interactively) invoke the query and kill the session, right?
Yes
Does that mean I also have to use the Enterprise SDK as well (in addition to the RAS/View SDKs)?
Yes
So an extra Enterprise logon (and thus a CAL session) is needed to kill the session?
Not if you use the Enterprise Logon that you used to view the report, I believe it can nuke itself. I have not tried this.
Assuming I can kill the session, but which session to select and kill? Is LOGONTIME is the nearest field for identifying my own session?
I believe so, Adam may be able to answer this.
Plainly speaking, what I want to achieve is when user closes the report browser window, his Crystal server session also ends accordingly. And a single web session corresponds to a single RAS connection session.
Thank you,
John

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package isdbs.view.security;
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import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
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