I'm running Windows NT with the Office 2000 suite. One of the quirks that I've grown to like about Office 2000 is that when you open multiple files in any given program (Excel, for example), an equal amount of tabs are shown on the task bar at the bottom of the screen. This makes it extra convenient when switching from file to file. For some unknown reason, my computer recently mysteriously reverted to the "old" system, in which only one tab is shown for the program itself, and files must be minimized to switch from one to the other. My question is, how to I switch it back?