Hello,
You will need to have the sequence context in your VB code, and access SequenceContex.StationGlobals.GetVal("MyLookupString"). This will return the data contained in the lookupstring. There is an NI example (attached file) that shows how to create a simple ActiveX DLL that is accessing a station global variable.
Roberto Piacentini
National Instruments
Applications Engineer
www.ni.com/support