Params adr is the Object Database address of the object whose display window you wish to open.
Action Opens the window associated with displaying the object at adr.
This is one of the few window verbs that requires the address of an object rather than a title. That's because there is by definition no window open with a title when this verb is needed. The difference between window.open and edit is that this verb does not explicitly establish addr as the target for subsequent content-editing verbs. We recommend you use edit to open a window for editing and window.open to open a window when other verbs that are not content-changing are to be used on it. The flReadOnly parameter was added in Frontier 7.