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Idea for Backtest with variable spread

If before call the functions ,OrderSend() and OrderClose() the expert check in external database the value of Ask and Bid and if the price can be placed, for takeprofit and stoploss the same process will be done. What is the opnion of experts programmers ? sorry my bad english

DDE Client DLL

Where can I find a dll to mt4 work with a client dde ??? someone can help me