ea working in more than one pair

[18081961]

Hi all,

 Say that I want to use same ea in more than one pair, is that enough to put different symbol an magic number in each ea instance to avoid conflicts (Iscontext busy) or is that necessary to  use of  a Retry routine or even make use of a mutex ?

Thank you in advance for any clarification. 

Luis 

[William Roeder]

1. Adding a magic number filter to the order select loop is sufficient if all EAs on all charts are using a unique one. https://www.mql5.com/en/forum/143514
2. Handling context busy is always necessary (EA vs manual trading). Mutex is best (for multiple EAs) See my mutex code