MT API Question: SendOrder()

[Forex Trader]

In MetaTrader, with Expert Advisor, we can specify slippage in SetOrder() or CloseOrder(). Is there any way to send similar orders with slippage using API SendOrder(&SendOrderInfo)?

Which parameter in SendOrderInfo structure is related to slippage? What are the use of crc and req_code ?

Sorry for so many questions in one time. Thanks in advance.

[Forex Trader]

You need to process slippage yourself. server does not receive any information about slippage