Estonia,
At the very least, Agilent probably provides a dll interface to calling their driver. You could call those dll functions from TestStand using the C/C++ DLL adapter (or the Flexible DLL Adapter if you are using TestStand 2.0.1 or below). If they provide an ActiveX or COM interface (which sounds highly likely considering the name of IVI-COM) then you can use the TestStand ActiveX/COM adapter to call into these drivers.
NI MAX is the NI Measurement and Automation explorer. Because these drivers are not National Instrument's drivers there will not be an interface for them to be used within NI MAX.
Let us know if you have any other questions.
Regards,
Shannon R.
Applications Engineer
National Instruments
