>>>>You can only use built-in functions in #IF.
>>>>To control what to compile, you would use #IFDEF/#IFNDEF in combination with #DEFINE/#UNDEF
>>>>
>>>>>
>>>
>>>By built-in functions do you mean those that are compiled? And if I use #IFDEF/#IFDNED, I still can't use them when running/testing the application in IDE, right?
>>
>>You can probably define something like
>>
>>#DEFINE DEBUG .T.
>>
>>Then
>>
>>#IF DEBUG
>> My IDE Code
>>#ELSE
>> My Production Code
>>#ENDIF
>
>I need to have two production codes depending on some constant.
>
>Thank you for your suggestion.

Do you want to include this into your final code or have two separate versions of the code not compiled? Can you work along the lines above?