>>Secondly, what we used to send to our customer, was ONE sheet of paper with just a few lines of text, and three barcodes marked 1, 2 and 3. Not all our customers were rocket scientists, but they all understood what to do.
>
>Just to clarify what Tore is saying, what he's referring on the sheet of paper are the barcodes for programming the reader. Many barcode scanners can be programmed by scanning specific barcodes (and as Tamar mentioned, it's likely you'll be able to find the manual online). Once you obtain that information, all you have to do is to make a printout with the necessary barcodes and deliver that to your customer.

I concur. We had to "program" the scanner once upon a time... 1995 IIRC, and the whole programming manual was a single sheet of paper with barcodes printed, with a caption on each describing what it does.

Nowadays, I'd just scan that sheet at some insane setting, like 1200 dpi, and keep it somewhere on my disk, then print on a simple laser printer whenever needed. Back then, even barcodes printed on dot matrix printers worked, as long as you didn't try to make them too small and there was some ink in the ribbon.