USB-1208FS: Initialize counter to zero.
DeviceIndex” is a small integer, the array index specifying which HID
device in the array returned by PsychHID(‘Devices’) is interface 0
of the desired USB-1208FS box.
See also Daq, DaqFunctions, DaqPins, DaqTest, PsychHIDTest.

4/15/05 dgp Wrote it.
12/20/07 mpr tested it on 1608FS and then made input argument optional
1/10/08 mpr swept through trying to improve consistency across Daq
5/22/08 mk Add (untested!) support for USB-1024LS box.
5/23/08 mk Add caching for HID device list.

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