Common Folder Copier - copy positions between MT5 terminals on the same PC - expert for MetaTrader 5

Common Folder Copier copies positions from one MT5 account to one or more MT5 accounts running on the same computer or VPS. It is a single EA with two modes. The Master writes a snapshot of its open positions to a small file in the terminals' shared Common\Files folder several times per second; each Slave reads it and makes its own account mirror the master. No DLL, no internet service, no external software.

How it works

• Master (attach to one chart of the source account): writes all open positions, or only one magic number, with symbol, direction, volume, SL and TP. The file is written to a temporary name and then replaced, so a slave never reads a half-written file.
• Slave (attach to one chart of each receiving account): opens the positions that have no copy yet, reduces the volume when the master closes part of a position, keeps SL and TP in sync and closes the copy when the master position is closed.
• Each copy is linked to its master ticket through a terminal global variable, so the link survives partial closes and terminal restarts.
• If the master file is older than the configured limit (master terminal closed or frozen), the slave stops acting instead of closing everything.

Inputs

• Mode - Master or Slave. Channel name - the same in master and slaves; use different channels to run several copiers at once.
• Update interval, ms.
• Master: copy only this magic - -1 copies all positions.
• Slave: lot mode and value - master lot x multiplier, or a fixed lot (rounded to the symbol volume step and limits).
• Slave: symbol prefix / suffix - for brokers with names like EURUSD.r or mXAUUSD.
• Slave: reverse - copy in the opposite direction (SL/TP are not copied in this mode).
• Slave: copy SL and TP, magic number of the copies and maximum age of the master file.

Notes

• Designed for hedging accounts. On netting accounts opposite positions on one symbol net out, and the EA prints a warning.
• Both terminals must be on the same machine (the Common folder is shared by all terminals of one Windows user).
• Check your prop firm's rules before copying between accounts: some firms restrict copy trading between different people's accounts.
• Tested in the Strategy Tester with a harness that opened, partially closed and closed master positions at random: after 918 checks the copies always matched the master in count and volume.