Margin requirements for futures and futures options are established by each exchange through a calculation algorithm known as SPAN margining. SPAN (Standard Portfolio Analysis of Risk) evaluates overall portfolio risk by calculating the worst possible loss that a portfolio of derivative and physical instruments might reasonably incur over a specified time period (typically one trading day.) This is done by computing the gains and losses that the portfolio would incur under different market conditions. The most important part of the SPAN methodology is the SPAN risk array, a set of numeric values that indicate how a particular contract will gain or lose value under various conditions. Each condition is called a risk scenario. The numeric value for each risk scenario represents the gain or loss that that particular contract will experience for a particular combination of price (or underlying price) change, volatility change, and decrease in time to expiration.
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When you are considering taking a Forex Bookers bonus offers you will have to closely inspect the bonus terms to ensure you fully understand what volume of trades you will need to perform before any bonus cash becomes real cash, so always pair up bonus deals with the lowest volume of trades required, as you are more likely to turn that bonus cash into real cash by sticking to those bonuses when hedging your trades, which have the lowest volume of trades required.
The Federal Reserve Board and self-regulatory organizations (SROs), such as the New York Stock Exchange and FINRA, have clear rules regarding margin trading. In the United States, the Fed's Regulation T allows investors to borrow up to 50 percent of the price of the securities to be purchased on margin. The percentage of the purchase price of securities that an investor must pay for is called the initial margin. To buy securities on margin, the investor must first deposit enough cash or eligible securities with a broker to meet the initial margin requirement for that purchase.
Successful FX trading is based on knowledge, proficiency and skill. It involves analytical thinking, and something visual. When looking at what are Forex robots, it is clear that they cannot properly work in this manner. Market conditions tend to change all the time, and only an experienced Forex trader can distinguish between when to enter the market, or when to stay away.
Leveraged trading in foreign currency or off-exchange products on margin carries significant risk and may not be suitable for all investors. We advise you to carefully consider whether trading is appropriate for you based on your personal circumstances. Forex trading involves risk. Losses can exceed deposits. We recommend that you seek independent advice and ensure you fully understand the risks involved before trading.
In addition, I've had some comments from people suggesting that they'd like to see more varied order types than the simple Market Order. For carrying out proper HFT strategies against OANDA we are going to need to use Limit Orders. This will probably require a reworking of how the system currently executes trades, but it will allow a much bigger universe of trading strategies to be carried out.
In order to understand Forex trading better, one should know all they can about margins. Forex margin level is another important concept that you need to understand. The Forex margin level is the percentage value based on the amount of accessible usable margin versus used margin. In other words, it is the ratio of equity to margin, and is calculated in the following way:

Successful FX trading is based on knowledge, proficiency and skill. It involves analytical thinking, and something visual. When looking at what are Forex robots, it is clear that they cannot properly work in this manner. Market conditions tend to change all the time, and only an experienced Forex trader can distinguish between when to enter the market, or when to stay away. 
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