Portfolio trading, also called basket trading, depends on a combination of different assets related to different financial markets (Forex, stock, futures, etc.). The concept behind it is diversification, the most commonly accepted way of risk reduction among traders to protect themselves from market volatility, minimize the risk extent and keep the profit balance. A diversified portfolio is necessary for this strategy to reach its target profits otherwise it will be aimless.
Forex Seven EA trades on 20 different currency pairs till a sufficient total equity profit is reached, then it closes profitable trades. It's a highly reliable system with strict control over drawdown providing a high degree of protection to the account being traded.