[OS X TeX] Where (or what) is GhostScript?

[AES]

When I TeX something using TeXShop with TeX + Ghostscript selected, 
it seems to work fine -- but where (or what) is Ghostscript?

I have vague memories of acquiring and installing an app or utility 
called "Ghostscript" back in the OS 9 era or maybe even earlier, in 
order to give GraphicConverter (or was it iView MediaPro?) some added 
capabilities -- and of being confused at the time as to just what GS 
was, or did -- especially since there seemed to be several variants 
of it.

Now when I do a Finder search for "ghost" on my OS 10.3.9 system, the 
only thing that seems to turn up is a file named 
"ghostscript-8.ii2receipt".  So:

*  Where, and what, is Ghostscript?

*  Are there things I, as a simple-minded TeX user, should know about it?

*  Preferences I need to set for it, or commands I need to give it?

*  A manual or readme for it?

*  And can I open that receipt for it with some text editor, just out of
    curiousity, and without risking damage?
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