Fonts / GDK / Querying / how?

[Eric Harlow <linuxgeek yahoo com>]

In gtk 1.0.4, gtkstyle, there's a line of code to set the font 

gtk_font_load ("-adobe-helvetica-medium-r-normal--*-120-*-*.....");
 
Questions:

Is there a way to query the system for the list of fonts that are
available?
Where do the fonts reside on the system? 
How does the above line translate to the font on the system? 

I have a /usr/lib/texmf/texmf/fonts/afm/adobe/helvetic directory ..
but I don't see the connection.  Can someone give me a push down the
correct trail so I can pick up the scent?

 -Eric




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