Message during Process

Dear All,
i want to display a message like
MESSAGE 'say something' TYPE 'S'.
during a abap report is running.
But messages like this are only displayed at the next screen.
So how can i show them at the time when the command MESSAGE is processed?
I only know that it is possible because i saw it at the function "ws_download".
Thank you for your answers.

I think you are looking for FM SAPGUI_PROGRESS_INDICATOR
Rob

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    END APPLICATION TRACE ***
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