PokerTracker 3 imports text hand histories that are saved to your computer by the IGT Poker Network / Entraction client. Once imported, these hands are stored within PostgreSQL and made available for review and analysis in your PT3 database.
In December 2012 the IGT Poker Network closed, it is not longer available but the ability to manually import and display legacy hands remains in PokerTracker 3.
For general information on the initial setup of PokerTracker 3, please consult the PokerTracker 3 Quick Start Guide.