Sorry, don't know if NOTHING is in VFP 6.0. Seems like all the griping I've heard is about the wrong "something" in VFP 6.0, not the absence of "nothing." :-)
As for the DLL... No, I can't help you there either. We discarded it after we tore it apart to figure it out. I can tell you that it wasn't fancy though. If you have Visual Studio, you just create a small VB project and compile it as a DLL. The DLL needs to have a property that you set to NOTHING. Then, you just point to that whenever you need NOTHING. That seemed to be all the code that was in there.
Good luck.
Marty
Marty Smith, CSQE