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HID, how to receive/send 512 bytes in one transfer

Hi, I use LPC2148, I use keil USBHID example code and change hid descriptor like this:
0x96,0x00,0x02, //512 bytes in count
0x96,0x00,0x02, //512 bytes out count

question:
1. its that enough To support transfer over 512 bytes? do I need to do other configuration in the LPC board?
2. I use host windows PC write 512 bytes to LPC board, I only see EP0Buf contains the first 64 bytes, where to find rest bytes?
3. I also want to read 512 bytes from LPC board, where to put my code?

Thanks

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