Open APG Cash Drawer through an HID (not a port)?

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I am trying to electronically open an APG cash drawer through MS Access. It connects as a USB Human Interface Device (HID). I know how to and can write to USB ports (to tell the cash drawer to open, or tell a pole display what to write), but I don't know how to access or talk to an HID. It sounds as though I need to call the dll file somehow?

The manufacturer has sent me sample code, but it is in Visual Basic. I can write in Visual Basic through Access, but cannot open their files, and haven't been able to get them to send me pure code.

Any ideas on how to open the cash drawer?

Thanks,
Amanda