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I'm looking for a code sample which shows me the interaction between a portlet or an application and the virtual workspace. More precisely I would like to chose a file from the workspace (file-chooser), process in in the portlet and store either the output in a file or display it as html in the portlet. I know that a could create an external link from a file in the workspace and give this link to the portlet. But this would mean to click in the file, copy the link and paste it into the portlet which would always require manual intervention. And in this case the question is still how to store the result in my workspace.

Do you mean something like this? We call it Workspace Explorer

https://wiki.gcube-system.org/gcube/GCube_Widgets_Store#Workspace_Explorer

yes, thank you - I think that's it. I will try it out in the next days