Attached is LV_DLL_Occurrence.zip which contains a simple demo of setting an Occurrence from within a DLL file call from Labview, something that might be useful if you are writing your own data handler and want to signal when data is available. Note that when you open the demo.vi file in Labview, you'll have to re-enter the pathname to the DLL file (provided), since the demo.vi remembers the full pathname.
Duane Mattern