[ryduh]

The MagTek reader acts as a USB HID (aka a keyboard). When the cursor focus is put on a text field and you swipe a card, the MagTek device acts as if someone typed each character into the field. Then the javascript detects that and parses it out

[s1mpl3]

omg i see. That makes a lot of sense. Will test this out. Thanks a lot :)