In 4.2, on apex.oracle.com, I copied the Global page from one application to another. The 2nd application already had a global page, so I had to cancel, delete that page, and then go back to make the copy from 0 to 0 successful. Well, not quite. The target page is different from the source. It's not a true Global page, I guess, because it's icon doesn't have a zero (0) on it. So, there seems to be a prohibition aginst doing this. The way to get a tru global page is to create it.