What does it mean when to flatten your position? How to do it in the API of open source Tradelink trading platform?

What does it mean when to flatten your position? How to do it in the API of open source Tradelink trading platform?

Check this out:

http://www.finweb.com/investing/long-short-flat-what-your-position-means.html

This was from Tradelink's API:

http://code.google.com/p/tradelink/wiki/PositionTracker

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