Difference Between Logical Screen and Active/Physical Screen

Hi All,
Could someone tell me what is the Diffrence Between Logical Screen and Active/Physical Screen and what is the reason for having two screens instead of one.
Thanks in Advance,
Joseph Reddy.

Hi Marilyn,
Thanks You. I have found the answer to this.
All,
If you go to the SPRO>Logistics Execution>Mobile Data Entry-->Define Screen Management. Here you have two screens one is Logical Screen and another actual Screen and a program associated to this.
Here the Logical Screens are used within the program and Actual screens are the screens which are visible to the User. The Link between Logical and actual screen is present in the table T3130C. Program recognises logical screens.
Now suppose say certain functionality/create new transaction code for RF Device is not there in SAP and you want to Include/Create your own code in any of the User-Exits. Then you have to rename the actual screen to 9***. So that the system recognises the change in the screen and related User-Exit is executed.
Hope this is Clear.
Thanks & Regards,
Joseph Reddy.

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