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copied!<p>Cool - I'll try those options, as they're probably better defaults given my intentions. Unfortunately, I know my device is there and I'll eventually need read/write access later on (once I inspect the descriptors and have verifed it is infact my device). </p> <p>Which means that my real goal IS to know what's using it, so I can inform the customer/user: "Hey man, 'iexplore.exe' is currently using your SuperWidget device. You'll have to close that down in order to use SuperWidget application." (if not at the application-level, then at least at the phone support level.)</p> <p>I forgot to mention that the windows error reported by GetLastError() is:</p> <blockquote> <p>0x20. The process cannot access the file because it is being used by another process.</p> </blockquote> <p>(So your sharing alternatives will probably get the file open, assuming no FILE_SHARE_NONE on behalf of the other process).</p> <p>[edit]</p> <blockquote> <p>Yeah, it's painful alright. I have seen mice and keyboards get locked by whatever Windows uses to read from them. I've also seen a lot of people have trouble inside a VM like Paralells on OS X, where the HID class driver has the device open exclusively preventing the VM from using standard USB requests.</p> <p>I've seen some code that recreates what <em>ProcessMonitor</em> does. Maybe SysInternals is just electing to ignore device handles, but the same method (or a slight variation) can be employed here to determine the PID.</p> <p><strong>Mike</strong></p> </blockquote>

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