How to program with different device by NI-VISA?

Dear NIer:
firstly I will list my enviroment.
SW:Labwindows/cvi 5.5/VISA/MAX.
HW:HP pc/pci-gpib/GPIB-VXI/DD42916.
QUESTION:
1 MAX always think GPIB-VXI/C and DD42916 as a GPIB device.Why don't they think these devices listed above as a VXI device?
2 Since MAX think DDC42916 as a GPIB device, and DDC42916 supports word serial communication, How can I program with this message-based device by NI-VISA?
I searched for appropriate function in NI-VISA ref manual,but I failed.VXI WSPRotocal COMMand is not suitable here evidently.
3 Then how can I program the other device like register-based device and memory-based device under this circumstance?
4 if slot0 controller changed from GPIB/VXI to 1394/VXI
,then how to program?

east-
I see this question was answered (and then discussed again in depth) in the VISA forum. I'm posting these links in case anyone looks here for an answer.
-Scot

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