USB Library
QUERY_EXTENDED_INFO

The QUERY_EXTENDED_INFO command (0x0C) is used by the host PC application to get additional info about the device, beyond the basic NVM layout provided by the QUERY_DEVICE command. 

Table: QUERY_EXTENDED_INFO command format  

Packet Byte 
Content 
QUERY_EXTENDED_INFO 
1-63 
(padding) 

The response packet to the QUERY_EXTENDED_INFO command is microcontroller architecture specific (ex: different format for PIC18 versus PIC24 targets). See the the processor specific sections for the responses for each specific system.

MLA - USB Library Help Version : 2.16
http://www.microchip.com/mla