Going back... (how far?)... way back!
Version 6.0, under the View... Toolbars... Categories Tab, it is placed under something called "Searching" controls. At the same time, I notice that they provide "User Definable Tools" which I'm sure could easily be bound to the prev-proc and next-proc functions. I'm not an expert by any stretch, but I would suspect there's a "file" somewhere that is missing from your install that should contain the proper toolbar. I'd do a compare of the installs to see if he has a "Tagging" file that you don't. They'd probably be interchangeable between versions.
Good Luck,
Dan