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The low-level U3 functions are described in Section 5, but most Windows applications will use the LabJackUD driver instead.

The latest version of the driver driver requires a PC running Windows XP, Vista, or 7. The 3.07 version, supports Windows 98, ME, 2000. It is recommended to install the software before making a USB connection to a LabJack.

The download version of the installer consists of a single executable. This installer places the driver (LabJackUD.dll) in the Windows System directory, along with a support DLL (LabJackUSB.dll). Generally this is c:\Windows\System\ on Windows 98/ME, and c:\Windows\System32\ on Windows 2000/XP.

Other files, including the header and Visual C library file, are installed to the LabJack drivers directory which defaults to c:\Program Files\LabJack\drivers\.