how to transfer files using pen drive in LPC2387

Hi.

I want to transfer files using pen drive to LPC2387 board and vice versa.
I don't know how to do it.
Is there any documents from which I can learn something about this application or link for its sample code provide by keil as I am new in ARM family.

In my work I want to attach pen drive direct to the board and board is not connected to PC.
If any one has any idea regarding this let me know.

Thanks
dhaval