For something so specific you're better off searching the vendor's website instead of just Googling. Try going here:
http://support.symbol.com/support[
^]
I did a search with these parameters:
Search: .Net
Product Line: Micro Kiosks
Product: MK500
Document Type: All Documents
and came up with some results. The last document in the results (MK500 Product Reference Guide (P/N 72E-112998-03 Rev. A) looks promising, particularly Chapter 5.