Lutz,

Thank you very much for the detailed reply and help!

>>Hi,
>>
>>I would like to be sure that what I am doing is not possible. I am calling a function (using DO FunctionName) from the DEFINE CLASS statement. I get an error.
>>
>>Does it mean that I must have the function FunctionName as a Procedure in the CLASS?
>>
>>TIA
>
>Dmitry,
>
>A lot of stuff.
>
>First. This (see help DEFINE CLASS Command)
>

>DEFINE CLASS ClassName1 AS ParentClass
> PROCEDURE cName
>  ENDPROC
>ENDDEFINE
>

>Declares a Method cName of Class ClassNHame1. Even if it shares the PROCEDURE keyword and some syntax, it is not to be mixed with a function or procedure. There is a lot of difference.
>
>A (User Defined) Function could be called from anywhere, as long as it is to be found. For VFP, there is not much difference declaring a procedure vs. declaring a function.
>The declaration of FUNCTION or PROCEDURE does not determine how to use. Only the call (as below) determines the use. For short User Defined Function or Procedure are named UDF.
>
>

DO BlyBla

is not a function call. It's a call for a prg or a procedure. A function is called like

BlaBla()

. A function will have a return value, a procedure not.
>There are also differences if parameters are by value or by reference. See help for function calls and DO command.
>
>Both functions and procedures are stored in PRG files. A prg file in itself could be a procedure like unit called a program.
>
>Now calling an UDF needs the UDF to be found. Normally the UDF must be within the app or exe, or set visible using SET PROCEURE TO (see help), or if called like
>

DO MYPROG.prg

, within the same prg file.
>
>HTH
>Lutz