This policy setting allows you to define the user experience related to how pop-up windows appear in tabbed browsing in Internet ...

This policy setting allows you to define the user experience related to how pop-up windows appear in tabbed browsing in Internet Explorer.

If you enable this policy setting, the user cannot configure pop-up windows in tabbed browsing. You must specify one of the following values:
    0: Let Internet Explorer decide.
    1: Force pop-up windows to open in new windows.
    2: Force pop-up windows to open on new tabs.

If you disable or do not configure this policy setting, Internet Explorer uses the user's setting for pop-up windows in tabbed browsing.