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From: Andrew Jackson on 26 Jan 2010 12:07
>>> How many USB HID devices can Windows handle at one time ?
>>
>> I don't know how many Windows can handle but a single USB bus is limited
>> to 127 less the number of hubs involved. If one assumes 7-port hubs
>> (fairly common) then that would require about 18 hubs to support just
>> over 100 devices. How well Windows would cope polling that many devices
>> is another matter.
>
> Of course most PCs have multiple independent USB controllers/
> busses... The PC I'm working on right now has a dozen, and I could
> probably add another couple dozen with a combination of PCI and PCIe
> cards.

Indeed and mine has seven USB controllers in it. So it is possible to
add an awful lot of USB HID devices to a single PC! The various host
controllers (OHCI, UHCI, EHCI) do offload quite a lot of work from the
host but I've no experience of using a really large number of USB
devices under Windows to know how that will run.

It would probably be better to ask the original question in a Microsoft
newsgroup.

Andrew
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