These words are used to judge each transaction. Double opening means that this transaction is opened by both parties to the transaction.

Warehouse receipt

It must be a

Open a long position

, and another

open a short position

Receive the order

Double closing

This means that both parties are closing positions, one is long and the other is short; long

changes hands

, which is a

long closing order position

, a long position is opened to take over his

position

; a short change of hands is a

short closing

, a new short position is opened and accepted.