>Does anyone know of a way to determine if a variable has been passed to a function by reference or by value. This is a run-time question.
>For example:
>

>local a
>a='test'
>=Test(@a)
>=Test(a)
>
>procedure Text
>lparameter b
>*-- here, i would like to verify that the variable 'a' was passed to 'b' as by reference.
>...
>

The best you can do is this.
Obviously it's no use.

PRIVATE a
a='test'
=Testa(@a)
=Testa(a)
PUBLIC x
=Testx(@x)
=Testx(x)

procedure Testa
lparameter b
MESSAGEBOX("variable b "+IIF(VARTYPE(m.a)=='U',"Reference to a","is a stand-alone variable"))

procedure Testx
lparameter b
MESSAGEBOX("variable b "+IIF(VARTYPE(m.x)=='U',"Reference to x","is a stand-alone variable"))