How to use FileSource?

[<moti.ben-ari AT weizmann.ac.il>]

Hi Guilhelm,

I have an application that generates "dot" files and then I call the "dot"
utility to create a graphics files to display. However, I would like the
display to be incremental, rather than as a batch post-processing step, and GS
seems to be the ideal software for doing so. I found the FileSourceDOT class 
in
the API docs, but I couldn't find anything in the tutorials about using file
sources. Do you perhaps have a simple example that I could use to start from??

Thanks in advance

Moti