Use USB port to emulate keyboard

Hi,
Is it possible to to use an USB port of an embedded controller (PXI8108) to replicate a keyboard when plugged into a device expecting
a USB keyboard ? 
thanks,
Gary.
Solved!
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From what I understand about USB, I don't think you can do that.
The USB ports on the PXI controller are host ports and as such can't be used as device ports. A keyboard would be a HID device class. Maybe there is some sort of HID emulator that could be placed between the PXI and your UUT that is expecting a USB keyboard...
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