Call a ABAP Web-Dynpro-application via a BSP-Application

We have a BSP-Framework, that call several applications among other things other BSP-Applications, ITS-Application and other systems. Now I want to integrate a ABAP Web Dynpro-Application.
For the moment I can call the ABAP Web Dynpro-Application from our application.
This application runs in the same session as the Framework (verify in transaction sm04).
When I want to call another application in the Framework, the session will be killed (no more sessions in sm04). This happens also, when I want to call the ABAP Web Dynpro-Application a second time.
I guess, that the ABAP-Framework thinks I want to go outside the system (for example www.google.de) and close the session. I found out, that this wouldn't happen, if the application were suspended. But I found no way to tell the application via a url-parameter to suspend.
Can someone help me?

Thx for the tip,
but I can't firea suspend plug. Because I'm in BSP. I understand the docu so, that you have the option to call a other apllication like BSP from a ABAP Web Dynpro.
I want to call the ABAP Web Dynpro form BSP like this way.
1. Start BSP-Framework
2. Call ABAP Web-Dynpro-Application from BSP
3. Call another Application from BSP without automatically logout by unload ABAP Web Dynpro. (I have a chance to call the ABAP Web Dynpro again via url to suspend before I call the other app.)
Regards Stefanie

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>
> Hi Jon,
>
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[7.02 IFrame help|http://help.sap.com/saphelp_nw70ehp2/helpdata/en/15/c07941601b1d09e10000000a155106/frameset.htm]
>
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Call a ABAP Web-Dynpro-application via a BSP-Application

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