It's a two (2) pairs correlation system to use 3 currencies to make 2 pairs to open hedge orders on those (like EURUSD/EURGBP).
The expert starts opening four orders for each couple (2 plus and 2 minus) and wait to move prices in one direction to make a grid of orders.
Canto inputs minimum of three currencies and a maximum of five.
MT5-RingSystemEA
It's a triangular arbitrage system (three pairs correlation system) to use 3 currencies to make 3 pairs to open hedge orders on those.
VR Sync Chart Lite MT 5
The VR Sync Chart Lite indicator is written for demonstration purposes and shows how it is possible to synchronize the object