Question about the rules of ATC...

 
Symbol
Description
Lot
Margin
Spread
Limit & Stop
Levels
USDCHFUS Dollar vs Swiss Franc100 000 USD1 000 USD4080
GBPUSDGreat Britain Pound vs US Dollar100 000 GBP1 000 GBP3060
EURUSDEuro vs US Dollar100 000 EUR1 000 EUR2040

It shows the limit level of EURUSD is 40, but i see players of ATC 2011 use 1:100 level, or I misunderstand the rules?

 
You misunderstand the rules. "1:100" is leverage 40 is the limit/stop level, which is the minimum distance to pending orders from the current price.
Documentation on MQL5: Standard Constants, Enumerations and Structures / Trade Constants / Order Properties
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Standard Constants, Enumerations and Structures / Trade Constants / Order Properties - Documentation on MQL5