### Disable device
Here's one idea towards identifying which keyboard is which. You can use the command [**xinput**][1] to enable and disable devices.

### Example

 $ xinput list
 ⎡ Virtual core pointer 	id=2	[master pointer (3)]
 ⎜ ↳ Virtual core XTEST pointer 	id=4	[slave pointer (2)]
 ⎜ ↳ SynPS/2 Synaptics TouchPad 	id=12	[slave pointer (2)]
 ⎜ ↳ TPPS/2 IBM TrackPoint 	id=13	[slave pointer (2)]
 ⎜ ↳ Logitech USB Receiver 	id=9	[slave pointer (2)]
 ⎜ ↳ Logitech USB Receiver 	id=10	[slave pointer (2)]
 ⎣ Virtual core keyboard 	id=3	[master keyboard (2)]
 ↳ Virtual core XTEST keyboard 	id=5	[slave keyboard (3)]
 ↳ Power Button 	id=6	[slave keyboard (3)]
 ↳ Video Bus 	id=7	[slave keyboard (3)]
 ↳ Sleep Button 	id=8	[slave keyboard (3)]
 ↳ AT Translated Set 2 keyboard 	id=11	[slave keyboard (3)]
 ↳ ThinkPad Extra Buttons 	id=14	[slave keyboard (3)]

The above output shows the various devices that I have on my Thinkpad laptop. I only have 1 keyboard attached, this one:

 ↳ AT Translated Set 2 keyboard 	id=11	[slave keyboard (3)]

Now take a look at the properties available through this device:

 $ xinput list-props "AT Translated Set 2 keyboard"
 Device 'AT Translated Set 2 keyboard':
 	Device Enabled (124):	1
 	Coordinate Transformation Matrix (126):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.

From the above you can see that it's enabled, so let's disable it:

 $ xinput set-prop "AT Translated Set 2 keyboard" "Device Enabled" 0

To enable it:

 $ xinput set-prop "AT Translated Set 2 keyboard" "Device Enabled" 1

### The idea?
You could enable disable one of the keyboards using this command to determine which one you're on.

### References
- [second keyboard to run commands][2]


 [1]: http://www.x.org/current/doc/man/man1/xinput.1.html
 [2]: http://unix.stackexchange.com/questions/35649/second-keyboard-to-run-commands/35835#35835