For those of you not familiar, a walk forward analysis is the best way
to determine the long-term profitability of an EA through backtesting.
Exactly. Optimize in one period, and test the settings in another. Explained in a nice video series starting at What is backtesting? | Invest Press - Forex Trading Research and News You Can Use NO PROGRAM NEEDED.
No program needed.

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This software automates the walk forward optimization and testing analysis, transforming a tedious and time-consuming process into one that takes just minutes. You can download and try the Walk Forward Analyzer for 14 days absolutely free. The full version is only $19.95 US, and comes with free lifetime upgrades and support.
You can view tutorial videos and download the software at http://www.easyexpertforex.com/walk-forward-metatrader.html