In releases prior 3ds Max 4, the class of a reference value (as returned by the '&' prefix operator) was shown as Value. It is now the class 'ValueRef'.
ref = &foo.name
classOf ref -> ValueRef
if classOf x == ValueRef then y = *x
Nested property accessing allowed in '&' reference values in MAXScript.
This allows constructs like: r = &$foo.pos , and later *r.controller to mean $foo.pos.controller.
By Reference Parameter Passing