Can I index pages on demand?

  Hello,
  I have few queries on htdig
  1. Is it possible to index pdf files in a directory from a web application.    
  My requirement is that user will upload pdf files using the Web App and in the very next step she/he should get to see that file in the search result if it
  matches the search criteria . I want to call rundig programatically as and when required . Is it possible?
  2. Can htdig index multiple directories ?
  3. Is there any  API available for htdig
  I would greatly appreciate some help on this.
  Regards,
  Pallab



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