If it's different MT4's you can use pipes.
Please see: https://www.mql5.com/en/articles/115

A DLL-free solution to communicate between MetaTrader 5 terminals using Named Pipes
- 2010.07.01
- investeo
- www.mql5.com
The article describes how to implement Interprocess Communication between MetaTrader 5 client terminals using named pipes. For the use of the named pipes, the CNamedPipes class is developed. For the test of its use and to measure the connection throughput, the tick indicator, the server and client scripts are presented. The use of named pipes is sufficient for real-time quotes.
Marco vd Heijden:
If it's different MT4's you can use pipes.
Please see: https://www.mql5.com/en/articles/115
Very useful info.
Thank you Marco vd Heijden

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I have 2 monitors with different mt4,
At first monitor(mt4) I attach all major currency pairs and all in H1 period, and the other monitor only show D1 period.
the question is :
how If I click GBPUSD in first monitor, and the other monitor automaticaly show GBPUSD in D1 period ?
Is there any indicator for this ?
regards