This is way a function should just do it's job (return a value) rather then having side effects like

change of Parameters
Output
....

VFP's style to mix up function and procedure (determination by the way to call instead of definition) makes this very unclear.

Lutz

>In one of my apps I just found and fixed a subtle edge-case bug caused by short-circuiting of logical operators. With my coding style I'm not usually vulnerable to it so it was interesting to be reminded of this feature of VFP.
>

>LOCAL ;
>	llFlag
>
>llFlag = .F.
>
>CLEAR
>
>IF MyUDF( "First Argument" ) AND llFlag
>
>ENDIF
>
>IF llFlag AND MyUDF( "Second Argument" )
>
>ENDIF
>
>RETURN
>
>FUNCTION MyUDF ( tcArgumentPosition AS String )
>
>?"MyUDF( ) called when it is " + tcArgumentPosition
>
>ENDFUNC
>