Is it possible to check in LotusScript if a back-end document is already opened (but not active) in the current workspace? If so, is there a way to activate the corresponding window?
No to the first question (unless you do some custom programming to keep track of what documents are open, for example using an environment variable).
However, when you call NotesUIWorkspace.EditDocument and specify a document, the default behavior is to just transfer focus to the document window if it's already open.
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