Broker: Broker is a company or individual that executes futures and options orders on behalf of financial and commercial institutions and/or the general public. A broker charges a fee or commission for executing buy or sell orders for a customer. In commodity futures trading, the term may refer to:
a) a Floor broker, a person who actually executes orders on the trading floor of an exchange;
b) an Account executive or associated person, the person who deals with customers in the offices of futures commission merchants;
c) the futures commission merchant.
Call: There are three meaning of the "Call" term. It could be:
1) An option contract giving the buyer the right but not the obligation to purchase a commodity or other asset or to enter into a long futures position;
2) a period at the opening and the close of some futures markets in which the price for each futures contract is established by auction;
3) the requirement that a financial instrument be returned to the issuer prior to maturity, with principal and accrued interest paid off upon return.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.