What does the getfield(%line, 0) do?
It gets the first string before a tab. A tab is delimited as \t in TorqueScript (as with most languages).
The way the VCE manual works is like this:
0\tinformation.png\tHistory\tThe Etob was formed sometime around August 27th.
To get "information.png" you would use getField(%line,1);
To get "History" you would use getField(%line,2);
To get "The Etob was formed sometime around August 27th" you would use getField(%line,3);