Hi Bill yeah "Export" is actually short for "Export selected objects" - it lets you write out just some of the objects instead of everything, based on the selection. If nothing is selected then it will ask you to make a selection, and the prompt for that is in the area where all command prompts go which is in the upper-right area of the main window.

Then like you already saw, if you want to write out everything regardless of selection you can use "Save As" for that.

- Michael