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about slippage

What is slippage mean,can it be -? just like -3,-5, Or it must be bigger than 0? If Bid=1.0140 the: OrderSend (Symbol(),OP_SELL,Lots(),Bid,5,Bid+SL*Point,Bid-TP*Point,tdcomment,magic,0,Red); will be trade from 1.0135 to 1.0145, Or will be trade from 1.0140 to 1.0145? I let slippage=0, but in the

How can I optimizat the variables in the expert running time?

We can optimaization any variables in the history testing , and get the best variables. But I want to the expert optimaizate the variables in the expert running time, and the expert always chang the variables in the future. for example, run a expert in the 1M eurusd windows, when 0 hours, the

How to quickly to open two order?

Hello,everyone. I want to design to open two order in the same time, open buy first then open sell in the same time. But always only one order can be opened, the other one cannot be opened? why