return Data from BSP back to ABAP

Hello,

I am very new to BSP-development, but spent already many hours finding a solution for my problem:

I am calling a BSP-application from a ABAP-report using

CALL METHOD cl_http_ext_webapp=>create_url_for_bsp_application

and CALL FUNCTION 'CALL_BROWSER'

this works fine, including bsp_start_parameters to pass Data from ABAP to BSP -> OK so far!

But:

user is taking some actions in BSP application and want to return Data back to his ABAP-session/dynpro.

How could I get this thing done??

Thank you for your help!!

Dominik