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    Dim is_in
    is_in=0
    ...
        status=RDR.IsCardIn(is_in)
        CheckStatus status,"IsCardIn"
    Loop
    
  2. or download this
           [id(0x0000000b), helpstring("method IsCardIn")]
            HRESULT IsCardIn(
                            [out] VARIANT* is_in, 
                            [out, retval] VARIANT* status);