[openfirmware] Some word not in ofw.c32 ?

[胡松涛]

Hi,

I want to write some application when I go into the interpreter, I follow  
these tutorial:
http://www.openfirmware.org/1275/practice/

But when I learn the first one: 16 Color Text Extension, I met problem. I  
want to have a try on foreground-color, but it seemed can't run and  
returned some information:

ok foreground-color
Tried to access instance-specific data with no current instance
ok

I have this one on my laptop
/packages/terminal-emulator

Did I miss some thing when I read the documents?

I'm pretty new with Open Firmware, are there easier tutorial for beginners?

references:
http://www.openfirmware.org/1275/practice/
http://www.openfirmware.org/1275/proposals/index.html