How to determine if entry came from being scanned in or being typed in.

I am working with a windows CE device ( specifically a Psion Teklogix 7535 G2) and using Visual C++ to code it.  I have several entry fields in my program where the entry can either be scanned in or typed in.  I was wondering if there was a way to determine if the entry came from being scanned in or from being typed in.  Any help would be greatly appreciated.
meldsaAsked:
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alexey_gusevConnect With a Mentor Commented:
unless you use scanner SDK, you can't detect it by default.

nevertheless, usually there is some standard utility like ScanWedge, where you can define e.g. training characters to be put at the end of the scanned barcode and then easily detected in your code
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