Did you know that the lower leg is actually called "Cnemis", I didn't.
I got XSI Foundation Upgrade from 4.2 to 6.0, this past December, but I wasn't able to use it until about now because the license server wasn't able to retrieve my MAC address, turned out I don't have a C drive (long story involving Linux on my primary IDE drive, and Windows on the SATA one), and the program required one. I hex edited the exe to change c:\ to g:\ and now works.
I didn't upgrade from 4.2 to 5.0 because I didn't have the money and missed the deadline for the upgrade (you'll notice there is no upgrade price for Fnd), I had some grief with SoftImage and decided not to upgrade at FULL price, but did now.
One of the things I noticed is that when upgrading, you don't get a new box and manual, so maybe next time I'll just buy a new License, depends on whether or not I feel the extra $100 are worth it.
Anyway, I do like the program, and since I just finished wrestling with my model exporter, I decided to work on an old character model I have and see if I can get it (her) into the engine, which brought me to find a name for the part of the leg thats not the thigh, and thats how I came across the word:
I've been toying with the Tao code so I can make a mono-winforms Simple OpenGL control, so far, I am just gritting the wrapper for GLX functions... not fun.