>Is it possible to hide just a page tab or two from a particular user or user group. Then, the application would only make it visible to a certain user group?

In a PageFrame, right? Unfortuanly no, not with the VFP pageframe. But yes with the Mike Helland PageFrame! (Shameless plug, I know).

Check out "mhTabs" under Files>Classes-VCX and it is under there, and there is a doc that tells you how to hide a specific tab.