Communicating with a USB device via C/C+

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I have just installed a new USB device which is functioning since the
demo tool talks to it just fine and it is listed in the device driver
table. However, the relevant documentation says little more than run
setup.exe. This is a new area for me so I would appreciate you pointing
me to some general documentation that covers communicating w/ device
drivers. Will be using Visual Studio C++ with XP or Server 2003.


Thanks,

jh

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