MagTek USB MagnePrint Swipe Reader with Encryption - Manual (Page 69)

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APPENDIX B. MODIFIER BYTE DEFINITIONS
This appendix is from the following document found on www.usb.org: Device Class Definition
for Human Interface Devices (HID) Version 1.11, and specifically for this manual, Section 8.3
Report Format for Array Items.
The modifier byte is defined as follows:
Table B-1. Modifier Byte
Bit Key
0 LEFT CTRL
1 LEFT SHIFT
2 LEFT ALT
3 LEFT GUI
4 RIGHT CTRL
5 RIGHT SHIFT
6 RIGHT ALT
7 RIGHT GUI