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It is not! All the language interfaces they have on that page are simply wrappers around the DLL. Some more complete than others. The C# one seems to import all the functions (well at least a lot), the LabVIEW wrapper is extremely minimalistic.

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The caveat here though is that USB is not an easy interface even in LabVIEW. I've heard that many people decide to make a MAX configuration instead of USB driver because it's just so damned low level and does anyone remember the difficulties with webcams? I use libusb and a 3rd party wrapper for the RTL-SDR which is not only far easier but much faster. A wrapper and DLL driver is probably a must for asynchronous callbacks - it's not for the faint-at-heart. The only time a USB device is easy is when it presents itself as a COM port which I very much doubt for streaming high speed IQ data.

The Disconnect can take a device ID (according to the matlab example). However. this little gem was in the python: note: the API can only currently access one at a time I would expect better from them (intern?). Their proprietary software supports multiple devices so its just what they are supplying with the RSA API. All their GPIB and Ethernet devices are SCPI compliant so I wouldn't be surprised if it was just SCPI over USB with Bulk transfers for IQ data streaming. But considering the state of the API, you never know. You'd need the programmers reference.

Today I told NI, that I am not willing to join a subcription program, in which NI can increase the pices as they want or to shutdown my software and that LabVIEW 2022 will be my last version. I just can encourage all other guys to do the same and to not accept such a pricing model.