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How Does A Special Memorandum Account Work
The Margin Account holds the funds that are MUST for any margin trades. Any funds excess of the MUST for margin trades are kept in the SMA account. These funds can be used for further Margin trades in new securities [funds get transfered into the Margin Account]. They cannot be used to met the Shortfall due to margin calls on existing trades. New funds need to be arranged. More at http://en.wikipedia.org/wiki/Special_memorandum_account