PDF (adobe.com)

Assign a target for a selected slice or hotspot

A target is an alternate web page state or web browser in which the linked document opens.

 Type the name of the HTML state in the Target text box or select a reserved target from the Target pop-up menu:
_blank
Loads the linked documents in a new, unnamed browser window.

_parent
Loads the linked document in the parent stateset or window of the state that contains the link. If the state containing the link is not nested, the linked document loads into the full browser window.

_self
Loads the linked document in the same state or window as the link. Because this target is implied, you usually don’t need to specify it.

_top
Loads the linked document in the full browser window, thereby removing all states.