USB HID USAGE page

I am working on the USB HID devices. I have downloaded the HID tool from the http://www.usb.org link. I have question that while making the mouse or keyboard some times we use the generic desktop as a usage page and sometimes not. also what is usage max and usage min.
what is the actual need of this generic desktopp??
please do needful for this.
thanking you,
Sapna.

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