Terminal Variables

[holygrailfx]

I need to set some values in Terminal Variables/Global Variables in MT4 speak. I need to automatically label each Terminal Variable, with its currency pair and TimeFrame. So for example I name the Terminal Variable, BT_open, the EA would then create the follwoing according to curreny pair en Timeframe involved. BT_open_EURUSD/M5 ; BT_open_EURUSD/M15; BT_open_GBPUSD/M5 etcetra

Can anyone tell me how to do this?