The accounts window shows all your pertinent account information, such as your: equity, used margin and usable margin.
The accounts window displays the details of your account. The equity is the value of your account. The Day p/l shows your profit or loss in pips for the current trading day. The used margin is the required amount of your equity that is set aside as a good faith deposit in order to maintain your position. The usable margin is the equity available in order to absorb potential losses or open new trades. The gross P/L is the profit and loss in dollar terms. The margin column tells you whether or not your account has received a margin call. A margin call occurs when your usable margin falls below zero. When this occurs all open trades are automatically closed.