@Cell source question

[Jason Whittle]

As Edgar suggested, I've been becoming more acquainted with the
source, so when I wanted to make a macro that used the @Cell symbol
from within @Tbl, I grepped through the include directory, and found
that all the references to @Cell are in tblf. However, @Cell is never
defined, that I can tell. It's always given as a named parameter of a
named parameter of a symbol. How does one construct an extend path for
that?

Cheers, 
Jason Whittle