what is current X font?

Hi, I see the following X Window functions: XLoadQueryFont() XSetFont() XUnloadFont() XFreeFont() and of course one uses a XFontStruct to hold the info. But, does anybody know how to load a font structure with the values of the current font. i.e. How do I find out what the current font is? I only want Xlib or Xt functions. Thanks for hints, Colin