I don't know if I quite understtod your question but a barcode reader handles input over the keyboard, ie. you scan a barcode and Clipper thinks the barcode was typed on the keyboard.
Just so you test it:
mBarcode = SPACE(30)
@ 1,1 SAY "Barcode" GET mBarcode
READ
Once you run this program, the cursor is placed on the GET field. Scan a barcode and a number will appear on the GET field just like as if you typed it.
I know this is too basic but...
Let me know if this solves your problem otherwise post more details.
Sergio Terenas