MQL4 Reference 
Standard constants Trade operations
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Operation type for the OrderSend() function.
It can be any of the following values:
| Constant | Value | Description |
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| OP_BUY | 0 | Buying position. |
| OP_SELL | 1 | Selling position. |
| OP_BUYLIMIT | 2 | Buy limit pending position. |
| OP_SELLLIMIT | 3 | Sell limit pending position. |
| OP_BUYSTOP | 4 | Buy stop pending position. |
| OP_SELLSTOP | 5 | Sell stop pending position. |
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