VB.NET
Dim Ret, Pprdata As Integer
Ret = GpExppoll(Pprdata)
C
DWORD Ret, Pprdata;
Ret = GpExppoll(&Pprdata);
C#
uint Ret, Pprdata;
Ret = gpib.Exppoll(out Pprdata);
Python
Pprdata, Ret = ctypes.c_ulong(), ctypes.c_ulong()
Ret.value = GpibPy.GpExppoll(ctypes.byref(Pprdata))