# callback

The `callback` sample program demonstrates how you can control the conversion to generate specialized output while it is in progress. The program employs developer-defined callbacks during conversion.

To run `callback`, type the following at the command line:

    callback inputfile outputfile

where:

`inputfile` is the full path and file name of the source document.

`outputfile` is the full path and file name of the first HTML output file.

_FT_HTML5_bannerTitle.htm