There has been some incorrect information given in this thread.

A function optionally returns a value, while a procedure does not return a value. In most languages, the difference is specified in how you declare the subroutine. If you declare it a FUNCTION, it is always a function. If you declare it a PROCEDURE, it is always a procedure. However with VFP, I can use either FUNCTION or PROCEDURE.

When you make the call as a procedure, such as:

DO MyProc WITH Parm1, Parm2

I would not get a return value. The parameters, by default, are passed by reference. To pass Parm1 by value, I would make the call:

DO MyProc WITH (Parm1), Parm2
<pre>

If I make the call as

<pre>
RetVal = MyProc(Parm1, Parm2)

the parameters are passed by value. To pass Parm1 by reference, the call would look like:

RetVal = MyProc(&Parm1, Parm2)

The function may or maynot return a value. If you don't specify a return value in the function code, it will return .T. I can also ignore any return value and make the call like this

MyProc(Parm1, Parm2)

Finally, you can change the way parameters are passes with SET UDFPARMS. Note this is a global setting.

>Hi Mike
>
>Even more devious.
>
>I assume
>
>

myProcedure(param)

>
>also passes variables by reference then or is this only when using the DO ... WITH form
>
>Regards
>Geoff Scott
>