QUOTE(Tomi Maila @ Jun 7 2007, 02:11 PM) This doesn't make sense to me. A required input just indicates to the user that they need to connect the wire. The only difference I see is that in one case the wire is connected to the input terminal and in the other case it is not. Perhaps this makes a difference, however the "required" flag by itself does not carry any valuable info for the compiler. Of course, there may be some black magic that only NI knows but at face value, I don't see it.