Expert Advisor Programming by Andrew R. Young

EXPERT ADVISOR PROGRAMMING
Fig. 8.2 – Common tab of Expert Advisor Properties dialog.
You can view all of the terminal checkup functions in the MQL Reference under Checkup.
Demo or Account Limitations
You may decide at some point to sell your profitable expert advisor to other traders. You may also
want to provide a demo version for potential buyers to test. To prevent your EA from being freely
distributed or traded by unauthorized persons, you'll want to incorporate some kind of account
limitations that limit the usage of the EA to authorized buyers. You may even want to limit usage to a
particular broker.
To limit usage to a demo account, use the IsDemo() function to check whether the currently active
account is a demo account. If the current account is not a demo account, we will display an alert and
halt the execution of the EA.
if(IsDemo() == false)
{
Alert("This EA only for use on a demo account!");
return(0);
}
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