-openURL is pretty generic, working with any type of URL that there's an app 
registered for, so it doesn't have a notion of specific UIs like tabs.

If you send an AppleEvent directly to Safari, there might be a param to control 
tab behavior. But that would annoy users who have a different default browser...

—Jens 

> On Apr 6, 2016, at 7:24 PM, Graham Cox <graham....@bigpond.com> wrote:
> 
> Hi all,
> 
> My app uses [NSWorkspace openURL:] to display help pages in the user’s 
> default browser. Each new request creates a new tab (at least in Safari). Is 
> there a way to pass a hint that no new tab is created if there is an existing 
> tab for the same domain? I looked at NSWorkspace’s launch options but none of 
> those appear to apply.
> 
> If there’s no way we might need to consider a webview within the app instead, 
> but hoping that we can do it more easily.
> 
> —Graham
> 
> 
> 
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