2004s "Group Web Item" Explanation

Hi, Can someone explain the "Group Web Item" to me? I put several items in it, but when I configure the "Group Web Item" it requests a single subordinate web item? And when I run it only the one assigned web item shows up on the screen. Is it supposed to only display 1 item? Doesn't seem to make any sense to me.

What am I missing here?

Thanks, Ken Murray