Hello,
I have a PDA which is working properly but now i need to use it in other application like if my active window is Microsoft Word and I want to read a barcode and to get it value where the cursor is placed in the document , how can i do that , i don't even know where to start, can anyone guide me please ?

i don't even know where to start

www.google.com would be good place to start

I know but key words to use thats what i don't know :S