How can we collect data from different job search engines and display them in a single site?

How does some sites list the jobs offered by various job search engines. How do they collect data? For example, rediff job search allows the user to search for jobs across a number of job search engines / job portals. How does rediff collect the data?

Are there any established job advertising distributors in India?

Hi ,

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AFAIK, http://www.siftin.in is already doing that. It's under maintenance now a days.