What kind of multiple window do you want? There are two types. The first is the dialog window - more commonly known as the popup. This is when you display a modal window over the top of your applicatoin. It blocks the view of the main window and you can't input data into the main window until the dialog window is closed. You can use the code wizard : Option Generate Popup - to insert the code to component another window from your component or a component usage.
The other option is to open a new Web Dynpro ABAP application into a completely new browser window. For this we use navigation plugs. You can send some importing parameters via the URL to this new application. However it is important to note that in this situation you have two completely separate user sessions on the server. There is no direct data sharing or communication between these sessions.
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