Added a last-filename-used indicator to fill up remaining window space; it's in SaVi development code. I should have thought of this a long time ago, especially considering that I'd quickly select a constellation and then guess what I'd loaded by looking at the coverage panel, before checking the orbital parameters.
The filename should probably be in the window titles, but I couldn't make that work in Tk. (Tk/window manager interaction seems quite poor and non-standard, if my efforts to generate window icons from Tk (which work in fvwm2, but not in KDE or Gnome) are anything to go by. This is probably really a failing of the separation imposed by the X model, and everything that flows from that.)
I'm forever amazed by the low usability standards that unix software reaches. But I think I'd prefer to address it by gradually improving the software rather than writing documentation excusing the behaviour by describing it. At least, that's my excuse for SaVi not having much in the way of documentation, much less properly-*roffed-out man pages.