why USB driver is required ?

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From: Raj (Raj_at_discussions.microsoft.com)
Date: 02/01/05 

Date: Mon, 31 Jan 2005 16:47:05 -0800

If I develop my own embedded device with ethernet interface, I dont have to
write a ethernet driver on PC side. I can write an application on PC with
Win32 socket APIs and talk to my own-ethernet-interface device.

But if I develop my own USB device (may be for bulk transfer or HID or Isoch
or whatever), I need to develop my USB client driver, on the lines of DDK
examples. Why is it required with USB drivers. Is it because they are pnp
devices ?

Please correct me if I am wrong.

Thanks,
Raj

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