What format is expected for callbacks that are passed into the Reuters.fetch method in MATLAB 8.2 R2013b?

I saw the MATLAB example for Reuters.Fetch. It uses a callback named 'rtdemo'. I do not understand what this takes as input, what is expected out of this. Is there reference to show me how to write the callback function? Is there any code sample? 

Answer 1

[MathWorks Support Team]

Currently, the documentation is missing information relating to how the Callback is to be written. In order to see a code sample, you may look at the code in 'rtdemo.m' by executing the following: 

>> edit rtdemo