The interface text box displays the name of the current interface; the interface that you are currently working on. Note that there may be several other interfaces loaded into the Interface Builder, but only one can be current.
To switch to another loaded interface, or to create a new interface, type the name of the interface into this area and press
. The interface you specify appears and its layouts are shown in the Interface Builder.
While typing in the name of a loaded interface, you can press the
key to complete the interface name if possible. If there is more than one possible completion, a dialog appears so that you can choose the interface to display.