Hi All

Word 2003, XP
Networked printers with local drivers.

I'm trying to query a printer to establish if duplex is available.  
Everything I've researched points me in the direction of DeviceCapabilities.  
However, I can't get it to work.  I've included two calls for comparison.  
The iBins call is working and correctly returns a value dependent on the
printer provided.  The iDuplex call returns -1 which indicates a failed call.
Any assistance is greatly appreciated.

Private Const DC_BINS = 6
Private Const DM_DUPLEX = &H1000
Private Declare Function DeviceCapabilities Lib "winspool.drv" _
   Alias "DeviceCapabilitiesA" (ByVal lpDeviceName As String, _
   ByVal lpPort As String, ByVal iIndex As Long, lpOutput As Any, _
   ByVal dev As Long) As Long

   iBins = DeviceCapabilities(sCurrentPrinter, sPort, _
       DC_BINS, ByVal vbNullString, 0)
   
   iDuplex = DeviceCapabilities(sCurrentPrinter, sPort, _
       DM_DUPLEX, ByVal vbNullString, 0)