Tabbing is currently determined only by the browser’s own preferences; however, I think I read on this board that the FCK editor will be upgraded to support explicit tabbing actions for iBox links.
It is for links that are entered via the link tool, and the default is _blank (new tab). It won't change what was already there unless the moderator edits the link's properties to add a target window.
Generally speaking, links to iHub pages should be set by the moderator to go to the same window, and links off-site should be to a new window.
Individual browser settings can override those selections.
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